Hwei vs Yasuo

Poke with Devastating Fire (QQ) in lane: the fireball explodes on the first enemy hit and adds damage based on their max health.

Hit the same champion with two damaging spells: Signature of the Visionary (passive) then leaves a signature beneath them that explodes shortly after.

Pick the subject that fits the moment: Devastating Fire (QQ) for damage, Pool of Reflection (WW) to protect your allies, Crushing Maw (EE) to pull a group together.

Block a chokepoint with Molten Fissure (QE): the line of eruptions leaves pools of lava that slow and damage enemies.

Cast Spiraling Despair (R) on a champion surrounded by allies: the vision expands around them, slowing harder and damaging nearby enemies before it explodes.

Hit him with a cheap attack to trigger the Way of the Wanderer (passive) shield, then start the real trade: otherwise, it absorbs your best damage.

If you have projectiles, save them for after Wind Wall (W): it blocks them all for 4 seconds, on a 25 to 17 second cooldown. Other spells go through it.

Don't stand right behind your minions: each one gives him a target for Sweeping Blade (E), and he gets closer to you with every dash.

Get out of the line of his whirlwind, the third Steel Tempest (Q): without a knock-up, he can't cast Last Breath (R).

Judge his threat by his crit items more than his level: Way of the Wanderer (passive) raises his critical strike chance, so each crit item does more for him.