Blitzcrank Build Guide by BlitzNA
S11 Guide How to Play Blitz by the Best Blitzcrank in NABy BlitzNA | Updated on May 4, 2021
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Runes: MAIN RUNES
++8 ability haste
+9 Adaptive (5.4 AD or 9 AP)
+9 Adaptive (5.4 AD or 9 AP)
+15-90 HP (lvls 1-18)
Ability Order Skill Order
Threats & Synergies
Samira has two spells that counter your hook in lane. Outside of lane fighting Samira becomes easier because both your E and R can interrupt her ult. However in lane she is incredibly difficult to deal with.
Heimerdinger and Blitzcrank are incredibly powerful together. I'd honestly say it's his strongest lane partner. The moment you hit level two, if Heimerdinger has several turrets up and you manage to hook either the ADC or Support, followed by your e and then his e (his stun) It's almost a guarantee kill/use of their summoners or forces them to back. Between the empowered turret shots and overall massive damage Heimerdinger puts out in burst you can kill just about any bot lane. Especially if you're both 6 the sheer burst between the two of you is insane. Heimerdinger struggles because the majority of his spells are skillshots. Blitzcrank enables Heimerdinger to instantly nuke whoever. Granted you're hitting your hook. Heimer and Blitz are two champions that require lane control to be utilized to their full potential, Heimer constantly shoves allowing Blitz the freedom to roam or hit easier hooks without minions in the way. The two of them enable one another to be played effectively.
Caitlyn is definitely a top tier ADC going into season 10. The reason for this is a mixture of her, range, damage (burst potential as well as strong early damage), and lane dominance. Caitlyn does incredibly well with any CC champion. Blitz Cait isn't as strong as Morg Cait or even Thresh Cait because both of their CCs are more reliable. There's a slight trick to placing a trap under the target Blitz hooks because his E will make them bounce awkwardly. However if you can trap them it's almost a guaranteed kill between her and Blitzcranks burst. She also does an amazing job of dominating the lane from far and poking the opponent out.
Draven Blitzcrank is definitely one of my favorite combos. The reason for this is pretty obvious you hook the target Draven will nuke anyone. His synergy with any hook support is off the charts compared to most ADCs, His early MASSIVE damage, mobility and small amount of CC make him an amazing lane partner since you're both always gonna want to be pushing.
The reason why Lucian is strong with Blitz is the same as Draven and Trist, high burst mobility and strong early game damage. Lucian is a lane bully and also pushes incredibly well. The key to Blitzcrank is having lane pressure and Lucian is great at that, plus he can dodge just about any cc with his dash, and has insane burst potential.
Trist is a really underrated ADC in my honest opinion. She does kind of require you to get ahead early to snowball and just shut down the enemy ADC or enemy bot lane. The thing is though if you put her burst combined with Blitz CC and burst (she can also chase them down with rocket jump) it's almost an instant kill if you hook any ADC. Also Trist doesn't have a choice about shoving the wave, so even if the ADC player sucks if they're last hitting the wave is gonna shove making it easy for Blitz to get picks. Trist Blitz burst at 6 is INSANE, both her ult and your ult collectively do about 500 damage (after resistances and such), and that's just your ults meaning you're gonna 1 shot anyone bot.
Jinx is really good with Blitzcrank due to her traps, slow, and long range. The only reason I'm not giving her a 5 is because she lacks mobility which is incredibly important in this meta and if she doesn't get ahead early or you don't have a strong front line she will fall part really quickly. Also unlike the other ADCs I placed at 5 she doesn't nearly have as much burst or the same chase potential. (Unless you proc her passive which means you've already gotten a kill.) (Heimer is an exception, this is because Heimer doesn't need mobility to run down the opponent)
I haven't played with enough of them to know how good it is. What I do know is, is his burst is insane, and he does have a snare. However, it feels like no one knows what the hell they're doing while playing him. (I will come back to update this once I feel like I know him better)
Senna, Senna, Senna, hmmmmm this champion is weird for me because sometimes it feels like she's a 3 other times it feels like she's a 5. Hear me out, her CC is insane (free hooks) her speed up/invis makes Blitz lane free and she can shove waves quickly and deal decent damage. The only issue I have with her is, is she's super squishy and she has to charge up her auto. Her burst isn't bad, but it's not nearly as reliable. This lane is really strong but it requires you to be a little more patient and most likely you won't kill the opponent in one or two hooks. However it is definitely a safe lane for Blitz, and depending on the opposing bot lane you can definitely get some free kills.
Xayah should be a 5, but I swear man, even players in challenger have no idea how to use her snare correctly. Xayah's a really strong champion currently. She has really high damage early game kinda plateaus for a tiny bit mid game if you don't get some kills on her and just shreds everyone late game. This lane is nice for Blitz because she's one of those champs that shoves the wave naturally when trading or csing with her feathers has fairly good range and just the pressure that her feathers leave in lane is insane. She's strong with Blitz or any hook champion because of the cc follow up snare and high burst damage. I still can't bring myself to give her a 5 because I just don't think she has great chase potential or is as reliable as those I placed as a 5.
Ashe is awesome. Her damage, free vision, slow, lock down potential, and ultimate all synergize incredibly well with Blitzcrank. The major flaw with Ashe is similar to Xayah and jinx she doesn't have the greatest chase potential where I do find hers to be better than Xayahs it's still not quite as reliable. Also in the current meta and state of the game Ashe dies pretty easily. She has no mobility making her a riskier pick, however, I think she's an amazing lane partner and definitely one of the better choices.
I'm actually a really big fan of Twitch with Blitzcrank. People really underestimate how much damage this rodent does. Twitchs early game burst is actually really high and it's pretty easy to beat most bots. However he does have no mobility, is incredibly item dependent and really difficult to play correctly. He's definitely a good lane partner though. Just outside of lane he will kinda struggle if he can't free farm or get ahead early. You need to babysit him more than most ADCs.
MF is actually a really good pick at the moment she has really awesome damage. The only reason I'm not giving her a higher rating is because she's too reliant on items and if she doesn't use her double up correctly she doesn't have great lane pressure. Also she's not the ideal partner level 1 and 2 which is where you want to try and get your first kill. Thus I can only give her an OK because she doesn't have the same burst or kill potential that the ADCs above her have.
Yasuo is 50/50. The thing is Blitzcrank powerspikes at level 1 and 2, however Yasuo needs to hit 3 to really be able to fight with Blitzcrank. levels 4-6 are great for Yasuo however getting to this point in a healthy state can be a little rough. Yasuo isn't great at laning and honestly in lower elo they probably won't utilize his kit correctly. However, if you can get to 6 the kill potential is fairly high. He's not a terrible lane partner, just the first few levels I recommend playing REALLY SAFE.
I really like the Jhin Blitzcrank combo, he has really awesome burst potential and great cc with the snare. However, his reload mechanic makes him difficult to play with Blitzcrank the only time you can really hook your opponent and make the most out of trades and fights is if Jhin has all 4 of his autos. Jhin is really great at poking and fighting with Blitzcrank in brief trades, his kill potential isn't bad either. However his lack of mobility and inconsistent damage don't make him the ideal lane partner.
Ezreal oh Ezreal, my best friend. Honestly most Blitz players or hook champ players hate Ezreal, but honestly man I think he's amazing. HEAR ME OUT, MOST Ezreal players are terrible and have absolutely no idea what they're doing on the champion. HOWEVER, a good Ezreal player, one who knows how to play aggressive, will land their skill shots and knows how to manage the wave is actually amazing with Blitzcrank. The reason for this is, Ezreal actually has really high damage, amazing mobility and can dodge the opponents. The real issue is finding an Ezreal who's actually good. I can only give him a 3 but honestly a good Ezreal is really strong with Blitzcrank.
Casters are actually pretty good with Blitzcrank. Syndra isn't nearly as good as Heimer however she still does really solid consistent damage and she's also really great at naturally shoving the wave. Syndra also has amazing Burst and her kill potential is insane. I would give syndra a solid 4 out of 5 the only reason I don't see her quite as good as some of the other picks is because he early levels are pretty weak and she doesn't have as much kill potential. Her stun and overall damage though are an amazing combination with Blitzcrank.
With HOB she is really good with Blitz
Takes too long to scale, doesn't synergize at all with Blitzcrank (condemn can counter your hook). Damage isn't reliable, useless pre 6 and has no lane pressure at all. Forcing you into awkward fights or just being unable to play lane.
I really hate Sivir on my team or against me. She's good at shoving lane but does no damage at all early is super reliant on items and is just a terrible lane partner. She's good at being safe but terrible at pressuring the lane.
She has insane follow up/gap closing and can stun on top of your cc.
Blitzcrank has one of the strongest level 1, 2, and 6 power spikes in the game. If you can beat your opponent to level 2 and immediately hook either the ADC or Support you can force them to use their summoners.
Blitzcrank burst kill potential at level 2 and level 6 is incredible. People don't expect the amount of damage Static Field and Rocket Grab does.
Blitzcrank has the best pick potential in the game. Catching someone out of position with his Rocket Grab can completely change the tempo of the game. Rocket Grab is the safest hook spell in the game of all the supports. Unlike Thresh, Nautilus, or Pyke (Pykes hook can, but it only works on shorter walls and requires the opponent to be next to the wall), Blitzcrank Rocket Grab can bring the enemies over walls and directly to your team.
Blitzcrank can stack Rocket Grab, Power Fist (E), and Static field (ultP) to pacify his opponent making them easy to kill and unable to escape. These spells are also good tools for interrupting channeling spells such as Katarina ult.
Another cool feature which was recently added is Static Field now removes shields, meaning champions like Karma, Tahm Kench, Mordekaiser, etc all will instantly have their shields removed when you ult (Does not work on Morgana shield Black Shield). It also works on items such as Gargoyle Stoneplate.
Blitzcrank is Fantastic at snowballing and pushing leads bot lane. Also has really strong roam potential with overdrive once you get Mobility Boots.
Blitzcrank passive Mana Barrier is really great early on for using your low hp as bait and for keeping you alive longer.
Unlike most skillshots, Rocket Grab actually comes from your right hand rather than the center of the champions model. Making it easier sometimes to hit certain hooks or to catch your opponent off guard.
Blitzcrank has really weak lane pressure if you fall behind.
Blitzcrank can't harass his opponents.
It's very easy to kite Blitzcrank.
Typically requires an ADC with a strong lane presence because he himself can't clear waves, and ideally needs to get ahead early. Scaling ADCs force him to play passive which isn't ideal when playing Blitzcrank.
The slow on Overdrive counters his entire kit. Meaning you have to use it sparingly and you're forced to always build Mobility Boots.
Your mana costs are really high, and you'll have mana problems until you can complete Zeke's Convergence, or are able to get stacks from Manaflow Band.
It's difficult to escape if you're caught out of position because you have very little mobility.
Blitzcrank is incredibly reliant on vision control, meaning you need vision of the map to play him optimally and make picks. If your team is not warding or helping you to ward, it is very difficult for Blitzcrank to secure kills. Ideally you want the opponent not to be expecting your hook.
It's fairly easy to sidestep Rocket Grab unless you're using iBlitzcrank which makes the hook faster, and harder to see.
Unlike most skillshots, Rocket Grab actually comes from your right hand rather than the center of the champions model. Making it difficult to sometimes hit certain hooks depending on the position of minions (It's both a pro and a con).
Blitzcrank is actually kinda squishy and dies very quickly if caught out.
Flash is actually more important on Blitzcrank than it is on most champions. Something to be aware of, sometimes it's better to die and save your Flash then to waste it and live. There are also situations where you're going to die even if you use Flash. Trading your Flash for a main carries Flash is always worth it. This allows the other members of your team in future fights to capitalize on the lack of mobility the enemy will have with Flash down. The reason for this being that your Flash + Rocket Grab combo can completely change the outcome of a game. It can help to pick off a carry (or enemy who's way out of position), which in return can help your team to force a fight at baron , take drake , or help to siege the enemy base. Flash + Rocket Grab allows you to catch people out of position, force fights you normally can't force and it also allows you to pressure a siege.
Ignite is necessary because of the kill potential it can create in lane. If you're playing Blitzcrank you're looking to force fights, push the tempo of the game, and make people play the way you want them to play. It is important for Blitzcrank to snowball early game. Getting kills in lane, forcing pressure on the map and just overall kill potential botlane. Blitzcrank isn't designed to be played with Exhaust. You don't want to stall the game out with Blitzcrank you want to end it early, force objectives or put opponents in situations where they are down a man. This can only truly be done with these summoners Flash + Ignite...
*******The final armor runes are dependent on your match up bot. Armor for double ad. MR for double AP, MR and Armor if they're both.*******
Rocket Grab is essentially your entire kit. It's an incredibly powerful spell and is arguably the best hook in the game. The reason for this being that although Rocket Grab has a very long cooldown, it has the longest range by 50 at 1150, does fairly decent burst damage (it also stuns for .5 seconds), and is able to reliably bring enemies over walls unlike the other hooks. Something to be wary of, is don't hook champions like Amumu or Morgana, people with mass aoe (area of effect) damage and a cc. You're basically allowing them to engage on your team for free. For some reason everyone wants to group around the Blitzcrank, which is good and bad. (HOWEVER IF YOU DO, one cool trick you can do with Blitzcrank that most people don't know is you can ult mid hook, causing them to be silenced on arrival, I'll also do this to counter champions like Ezreal and Ekko so they can't escape. Mercury's Treads does negate your silence though.) Also this doesn't mean don't hook them it just means be aware of positioning. One thing to be aware of in higher elo is that Rocket Grab can be sidestepped.
From Plat down to Iron I would say it's fairly safe for you to just aim where they are, they won't really dodge. In Diamond+ I will typically aim my hook about where the opponent could potentially walk in the next full second, or as you'll see in challenger game players will constantly click up or down, and this may sound a little confusing but imagine the opponent has the afterimage from Ekko Chronobreak, I will often aim where they would have been a second prior. However, I won't lie to you, playing Blitzcrank trusting your gut and just building muscle memory of his range and how people on average move is the best way to get good at him. Don't be scared to miss your hook, I see a lot of Blitzcrank players scared to hook because they'll get punished or are useless after, but practice makes perfect. If you come into my stream and watch me or any of my vods, you'll see I constantly throw my hook out. Sometimes you'll even see me close my eyes for a second and throw a quick prayer out because the Rito gods knows I had no business hitting that hook. Max Rocket Grab first for CDR and damage.
God I hate this spell. After the slow nerf a few seasons back it's just something else. Basically, what it does is it makes you attack (attacking faster is basically pointless you'll only get like 1 or 2 extra autos in and usually people will run away) and move faster but for only a brief period of time. This spell is something interesting because essentially you can use it as a short gap closer or to reach an objective or teammate quicker, but it literally slows you after which is just counter productive to Blitzcrank. I'll tell you some cool tricks you can do with Overdrive. First, let's say you arrive to lane and the enemy ADC or support is by themselves hitting your turret for that extra gold, if your ADC is close by you can actually use Overdrive to quickly run at them and past their minions and if you hit the hook, sometimes you'll be able to stall long enough for your ADC to come clean up the kill. Another cool trick I'll do is I'll start walking backwards to fake the security that they can walk forward and I'll immediately blitz them with Overdrive and either go for the knock up from Power Fist or the hook and I actually get a lot of kills in lower elo doing this (granted my adc knows how to right click). Basically this skill can be used to gap close or run away from opponents. I level Overdrive at 3 sometimes, 4 if i'm being greedy with the extra hook damage, but personally I max W second, I'm one of the only Blitzcrank players who does this but I really find that the speed increase between each rank does a lot more than the minor cdr in leveling Power Fist instead. Your Job as Blitzcrank is to get there and hit the hook I like having Overdrive on a lower cooldown more than Power Fist.
Power Fist causes your next basic attack to be empowered doubling your attack damage and knocks up the opponent. Briefly stunning them. It's also an auto attack reset. Sometimes what I'll do is I'll Rocket Grab + auto once, Power Fist and then auto again for the most damage out of it. Only do this if you know the opponent doesn't have Flash or a way of them escaping. Otherwise, what you want to do is immediately click E Power Fist while the hook is going out that way you'll knock them up once they come back. Also don't worry about using it because it only cost 25 mana so it won't really impact your mana too much. Something you should try to do is rush to level 2 before the enemy bot lane. Level up Power Fist and then go for a hook. Usually you can get an early game kill or force their summoners. Getting rid of someone's Flash is great for Blitzcrank. It provides so much kill potential. Some small cool tricks you can do with your E Power Fist is you can knock Vladimir up while he's in his Sanguine Pool if you do it immediately. The same applies to Fizz and his escape. One really important trick to do bot lane against champions like Pyke and Tristana, you hook them and they don't use their jumps to escape if you wait about .25 seconds and then use Power Fist you can usually stop them mid jump putting them in a really vulnerable position. Also if you run at Ezreal and knock him up if he Arcane Shift away he'll be stunned for about half a second and you can shoot a quick Rocket Grab at him.
Cost: 100 Mana
Enemies attacked by Blitzcrank are marked and take lightning damage. Additionally, Blitzcrank can activate this ability to remove nearby enemies' shields, damage them, and silence them briefly.
Passive: While this spell is available, lightning charges Blitzcrank's fists, marking enemies. That are shocked for magic damage. This stacks up.
Active: Destroys damage shields on nearby enemies, deals magic damage, and silences.
Static Field is an aoe (area of effect) burst that silences and removes shields. Static Field is really great for getting kills in lane or roaming on the opponent early on. It does surprisingly high damage. Your full combo level 6 without Ignite does around 500-600 damage. Making it really easy for you to kill any ADC and just about any support by landing a hook on them even Aftershock supports. If you do hook an Aftershock support I recommend you do what I said earlier in the guide. Ult while they're coming to you and immediately follow up with Power Fist. That way they are unable to proc their Aftershock and are already going to be below half by the time they can proc it. The passive of Static Field is terrible. The only time you can really use it is if you know the enemy champion you're hitting doesn't have an escape (You honestly don't spend a lot of time straight up just autoing opponents as Blitzcrank, or you shouldn't be). Usually when you're playing Blitzcrank you want to use all of your burst immediately to get a target low/stop them from escaping/stop them from producing Aftershock (There are exceptions).
Keep in mind that using your ultimate for it's silence is viable even if the silence is brief. For example running at an Ezreal and immediately silencing him so he can't escape or using it to pop Sivir's Spell Shield or stop her from using it all together. A good silence can completely change a fight so later in the game or against certain opponents you will want to save it. Such as stopping an Ekko from ulting Chronobreak as he gets low this way he just dies, interrupting a Katarina's Death Lotus, or running at a champion like Ahri or Ryze (it will completely stop Ryze Realm Warp, it will only stall Ahri Spirit Rush) and stopping their ults from letting them get away. These split second silences can honestly win you games. Be aware of when you use your ultimate and what champions are on the other team.
Boots of Mobility:
Well, if you have decided you hate your adc and team to the point that you don't ban this champion WHO HAS A BASE MOVESPEED OF 355 WHICH IS FASTER THAN YOU WITH Boots, AND WILL 1 SHOT YOUR ADC WITH HIS OBSCENE EARLY GAME DAMAGE.
There are few ways to play around Pantheon. If you can get a level 1 hook on him and outtrade him then immediately shove for two and attempt to kill or force his Flash this will make lane easier in the beginning. It will also allow you to go for hooks on him or his ADC who will most likely have lower HP than you and your adc at this point. Outside of that the only real way to win lane is get a crazy hook on his ADC and manage to burst them before he kills your adc OR wait until level 6 and go for a hook and nuke him or his adc with Static Field. (Keep in mind Pantheon has a point and click stun and does insane burst damage.)
The other trick is either have your jungler camp him, as Blitzcrank works great with every ganking jungler or try and get good vision around their bot side jungle and attempt to kill his adc when he roams.
(I personally ban Pantheon in high elo)
There are other ways to play around her, such as ulting before she can click her Black Shield and immediately casting Rocket Grab. Another method is attempting to bait the Black Shield out by running at her and then clicking R. Your R can destroy her shield, however, if she's maxing it, it doesn't always work depending on her AP. Another method is aiming for the target you think she's not going to shield (baiting won't work in higher elo, D4+). These work but they're a little tricky and are slightly more advanced tactics..
Morgana completely counter Blitzcrank. However in lane, unless it's something like Morgana + Caitlyn, there's a very little chance she'll actually be able to kill you unless you're overstaying or you get ganked.
You can outroam Morgana, for example, if your ADC is useless, you know one of those guys who can't even right click, I highly recommend abandoning lane and roaming with your jungle or ganking top and mid. Morgana can't follow as effectively.
If he hooks your ADC there really isn't much you can do because he will pull them closer to his ADC and snare them on top of that. You can attempt to hook his ADC in return to try and stop them from killing your ADC. Hooking Nautilus will be pointless because he has most likely already used all his spells.
The way to beat nautilus in lane is by hooking him from really far away so that his ADC can't participate in the trade. Hooking him while his Aftershock is down, or by aiming for his ADC. Blitzcrank has very high burst damage potential so if you can manage to pull his ADC there's a good chance you can win the fight before he can react accordingly.
However, I recommend aiming for his ADC or going to hook him at max range so you can win the trade. Overall he does more damage and offers more CC than you do, so the only way to beat him is by burst or catching him out of position.
If you can Rocket Grab + Power Fist + Static Field in that order or Rocket Grab + Static Field + Power Fist to stop him from procing Aftershock you do have a good chance of killing him. However, Nautilus does win this matchup.
Broken sun champion:
Leona capitalizes on the fact that she has a very large amount of CC and is incredibly tanky.
Winning this lane is similar to the Nautilus matchup in the sense that poking Leona down with long range Rocket Grabs is pivotal here.
There's another more difficult tactic that you can use to beat Leona. When Leona uses Zenith Blade, where she throws her sword at you. So if you get hit by her Zenith Blade she will then land behind you. This is actually a really good opportunity for you to kill her ADC.
Normally ADC players will hide behind Leona and with her jumping behind you from the use of her Zenith Blade you have a brief moment where you can hook her ADC. If you manage to hit her ADC with your Rocket Grab, in this moment you can capitalize and there's a good chance you can kill the ADC.
(You can only use this tactic if you're not standing in the middle of the wave). Typically this is best done by standing near the wall or alcove players wont expect you to do this. You do a lot more burst damage than Leona does. However if she gets on your ADC and you can't immediately Rocket Grab theirs it's over.
The only reason I give her a 4 is because it requires you to know Blitzcrank at a higher level. However, its honestly not a terrible match up.
Similar to Morgana you can actually Rocket Grab her during a 3 second window once her Spell Shield cd is down. Your Rocket Grab is about 3 seconds shorter than her Spell Shield. Sivir is a pain because your Rocket Grab doesnt do any damage to her either.
The only real way to counter a Sivir lane is to roam or wait until you're level 6. At six you can ult her which will silence her for a breif moment and you can hook. (KEEP IN MIND your silence lasts for .5 seconds meaning you have to hook instantly, also if she is far enough away she will be able to Spell Shield before the Rocket Grab hits.)
Basically this is a lane where you want to widdle him down or go for hooking his ADC. He doesn't really have any kill potential on you but at the same time you can't really do anything to him either so it's very skill dependent. Overall really boring lane, but you do have the chance to kill him.
Alistar can't really do much to you, unless he's able to land his full combo on your ADC or if you pull him poorly. Similar to Braum you don't want to hook Alistar if your adc is standing next to you as he'll knock them up. However, keep in mind if you do hook Alistar that you NEED to immediately Power Fist him and RUN (use Overdrive if you have it) BACKWARDS or he will then knock you up and most likely kick you towards his ADC with your spells down. If you can Power Fist him in time he won't be able to kick you backwards however he still may be able to knock you up.
Similar to Braum, this matchup it's very skill dependent and revolves around you either killing him at 6, hooking his ADC or killing him before he's level 3.
If Thresh flays you, he'll proc Aftershock at this moment you can Power Fist him or walk backwards. Once his Aftershock is down you can hook him freely and he's actually really squishy. However if he doesn't waste his Aftershock the key to this lane is whoever can hook the opposing ADC will win.
Thresh does have a minor advantage because he can hook you, however if you can survive and immediately hook him after his Aftershock pops, it's fairly easy to kill him. Thresh is really squishy early on.
If he's with Xayah, you're pretty screwed in lane, unless they really misplay. You can hook him, and he is really squishy, but if he's with Xayah they just enable one another too much freedom.
However on his own he's actually really easy to kill and someone you can hook and knock up fairly easily. However, do keep in mind that if your ADC is really close to you he can knock them up in return and potentially kill them. Always be aware of your ADCs positioning.
Pyke can't really kill you because he doesn't have the burst for it, plus at 6 your passive actually stops him for executing you typically unless the Pyke player is good and waits.
To beat him as Blitzcrank is something that takes practice, when you hook Pyke if you wait about .25 seconds and then click your Power Fist instead of instantly, you'll actually stop him mid dash, most Pyke players will immediately Phantom Undertow after being hooked and if you wait just a tiny bit you'll usually catch them off guard and stop them from escaping. It just takes practice and eventually it becomes muscle memory. (you can do this with Tristana's jump too if she doesn't buffer your Rocket Grab).
If you're new to Blitzcrank, Ezreal can be a little rough at the start.
Karma, Lux, Lulu, Nami, Janna, Sona, Soraka, Senna: Everyone who I have rated as a level 1 threat basically dies the moment you hook them. All of these matchups are very easy for Blitzcrank. They just rely on you hitting your Rocket Grab. If you're scared you can hold it to pressure them away however, hooking them is pretty free in terms of kill potential. Most of these picks are poke heavy champions. Keep this in mind. You don't want to allow them to abuse you by wasting your hook to frivolously. Holding your hook, can sometimes be just as good as hitting it. Also in some of these matchups the moment your look at your opponent when they cast a spell. Often in these moments you'll see players hesitate or not react nearly as quickly. These are good moments to go for a hook. One massive downside to Blitzcrank to keep in mind is that you do rely on your ADC more than most supports would. The reason I say this is, is because sometimes you'll get an ADC who doesn't know how to right click or an adc who won't thin the wave out and will just want to cs and you'll constantly get shoved in (making hooks really difficult). Hooking under your turret can definitely be your friend just be aware of your positioning and your ADCs.