Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
E into ganks/teamfights then run champ to champ laying down that AA stun.
This build is perfect to lock down mobile assassins like Katarina. You'll have so much attack speed you can actually kill them solo while they are stunned, but keep in mind your main objective: stun one champ then move on to the next.
Use Q to engage at range only. When your build is nearing completion, pure AA stuns faster and deals more damage.
Back out when low. Your masteries and BoRK can get you back in the fight without going home.
When this doesn't work
If the enemy team has 4 or more non-ult CC abilities, you can end up cannon fodder. If all their CC lie in their ults, then taking them out for your team can be an even trade.
Your AA will demolish jungle patches with ease after your second shop, but you will have trouble on your initial pass.
Go Gromp > Blue first, smiting right away. Not because you need the blue buff, but because it's the path that deals least damage. Let your laner know you are smiting first so they don't back out too soon.
If you are below 60% health after Gromp, wait a few seconds and pop your refillables before engaging blue. If you are below 30% health after blue, just skip wolves and go home.