Formation

Duelist's Dance forms on enemy champions when at the end of vision, where Fog-of-War darkens. It will always be in 1 of 4 positions. It will not proc (activate) if hit during its forming animation. If you hit it with an AA (auto attack), it has a short cooldown before a new one forms. After 15 seconds, it will transfer to 1 of the other 3 positions and will never proc in the same spot. To manually change go in and out of it's maximum range until it forms on the side you want.

Hit

Duelist's Dance can be procced by AA or with Lunge. Riposte will not proc Duelist's Dance. All other champions can see Duelist's Dance. If Lunge hitbox goes through an enemy and hits the mark, it will not proc as you need to hit it from that side. If you Lunge through an enemy champion and hit them, it will proc.

Vision

Duelist's Dance only forms if your enemy can see you. If you are in a bush, it does not form. If you are in a bush or over a wall and it forms, they have vision of you by ward or some other means. If you don't have vision of them but they can see you, it forms.

If a champion clones, Duelist's Dance will stay on the original while the clone will immediately start the forming animation letting you know it's the clone.

Range

Lunge distance is variable. It has the max distance shorter than Flash but further than Riven's 3rd Broken Wings. The tip of the indicator should be past the wall you're trying to jump through. You also don't have to be moving or face a certain way to jump through walls. It's best to put your mouse past your jump to guarantee max distance.

Hit

Lunge cannot critically hit. The attack range is in the circle indicator (bigger than your AA range). It will target whatever you mouse over making it possible to farm a minion near an enemy champion. If you mouse over empty space, you'll attack the closest target. If an enemy champion is in your range, it'll prioritize that champion. If there are multiple champions in range, it will hit the nearest champion even if another champion's vitals are closer and the targeted champion's vitals are not in range.
It will still hit during blind and Jax E (the name is blacklisted for some reason).

Lunge WILL hit stealth targets as long as there are no visible targets in range. Also, will hit targets in bushes without going into them and targets over thin walls without going through them. The hit animation comes out so you know you hit something. All effects like spellblade and icy will proc but you will not be able to see it. The enemy will be able to. Duelist's Dance and Grand Challenge can be hit on stealth targets.

Cooldown

When you hit something with Lunge the cooldown is reduced by 60%. CDR is taken first THEN the hit modifier so with 40% CDR and 60% cooldown refund there is still a short cooldown of about 2s. It is short and cheap to use. Jump through the jungle to farm monsters. Chase people into their base. Go anywhere. Blue buff gives you even more CDR and makes chasing you impossible.

Weaving

Lunge is an animation cancel and auto attack (AA) reset. Lunge+AA if you can attack vitals. AA+ Lunge+AA if they engage on you. Shortening the range makes the animation faster and will speed up your combo. Spell Weaving and Blade Weaving compliment Lunge well.

Cast

Riposte casts for .75 seconds but you are still invulnerable for the attack animation after. If you are hit during the attack animation with hard CC, you will not stun your opponent. During casting, you are immobile.

Targets

Everything in the hitbox receives damage. It does not apply on-hit effects. It does block minion and monster damage but does not slow them. Baron and dragon displacement is blocked but they are not stunned. If you block enemy champion CC and stun them, all minions hit will not be stunned. If at least one champion tries to hit you with hard CC, all enemy champions hit by Riposte will be stunned.

1st hit

The first hit slows for 1 second. This slow stacks with spellblade from Iceborn Gauntlet and icy from Frozen Mallet. Bladework is an AA reset and can interrupt your AA animation letting you get 3 AAs in quickly.

2nd hit

The second hit will always critically hit but not for 200% like normal crits but rather scales to 200% at max rank. This second hit can be increased with items. Infinity Edge adds 50% more damage at all stages. Greater Quintessence of Critical Damage are also additive not multiplicative. Like all critical hits, it does not affect towers or inhibitors and registers as a normal AA instead.

Description

Grand Challenge basically has the same mechanic as Duelist's Dance. It forms in the same positions. It procs the same and has the same mechanics. It just has all 4 vitals available and a time limit of 8s.

Grand Challenge is a debuff and can be removed with Quicksilver Sash. It can be severely challenged with Zhonya's Hourglass or other stall tactics.

Heal

Grand Challenge heal will proc when you have killed the target or hit all 4 vitals. It is best to put it on a champion that you can proc at least once and kill rather as hitting all four sides is much harder.

Grand Challenge will proc on death and on psuedo-death from Guardian Angel or Aatrox's Blood Well and similar abilities.

Start fights with Lunge and use Ravenous Hydra mid-dash. It gives you a surprising amount of initial burst from your Lunge+ Ravenous Hydra+AA combo. You should be able to use it several times in fights.

The active heals you from everything it damages. It also has a longer range than your AA so if a running enemy is just out of AA range and your Lunge is on cooldown, you can use the active and pick up the kill.

Ravenous Hydra does have a short cast time. You can shorten it with Lunge but not eliminate it completely.

Much like blue-build Ezreal, spellblade activates on Lunge. It gives you burst damage with your Lunge+ Ravenous Hydra+AA. It also makes chasing down fleeing champions easier as well as making clearing minion waves and jungle camps even faster.

Lunge+ ravenous hydra]+AA. AA or [[riposte if incoming cc. When Iceborn Gauntlet comes off cooldown, use Bladework and proc spellblade again. Spellblade and the Bladework slow stack.

Use skills when taking towers to do extra damage whenever Iceborn Gauntlet comes off cooldown. Be careful when enemy champions are near as the slow area is still procced and can hit champions resulting in tower aggro.

When running away, Lunge can hit backward. Since there is no cast time for Lunge you can Lunge away, slowing them with spellblade and healing from life-steal, all without stopping.