Ground Slam (E)'s attack speed slow cuts his crit auto-attack DPS, and armor plus the Granite Shield (P) barrier tank his Spinning Slash (E) burst for a dueling edge.

High armor and Granite Shield (P) reduce Yasuo's basic-attack and critical-strike damage. Unstoppable Force (R) is unstoppable during its cast and cannot be blocked by Wind Wall (W), making it reliable for counter-engaging or forcing a fight.

As a crit-based auto-attacker, his trades are halved by Ground Slam (E)'s attack speed slow and armor, and if he closes in, Unstoppable Force (R) knocks him up in retaliation.

Armor heavily reduces her Broken Wings (Q) physical combo burst, and Seismic Shard (Q)'s slow with Unstoppable Force (R)'s knock-up cut off her dash engage for kiting.

His AD autos and Crushing Blow (Q)-reliant damage are neutralized by armor and Ground Slam (E)'s attack speed slow, and his Warrior Trickster (W) clone engage is punished by Unstoppable Force (R)'s AoE knock-up.

Pure AP makes armor meaningless, and he dodges Unstoppable Force (R) and Seismic Shard (Q) with Sanguine Pool (W) while Transfusion (Q)'s lifesteal sustain damage dominates the lane.

He keeps kiting and harassing with ranged Boomerang Throw (Q) and autos, and armor-stacked Malphite can't stick to him while his HP just bleeds down.

Mana-free ranged AP harass ignores armor, and Mark of the Storm (P) stack stuns lock down Unstoppable Force (R)'s engage angle.

A Thousand Cuts (P)'s max-health magic damage and Snip Snip! (Q)'s center damage punish Malphite's armor-focused stats. While Malphite remains outside Hallowed Mist (W), Seismic Shard (Q) and Unstoppable Force (R) cannot affect Gwen, limiting his engage angles.

Ranged Shock Blast (Q) poke and Acceleration Gate (E) wall off his approach, and melee-form Thundering Blow (E)'s knockback cuts off even his Unstoppable Force (R) engage angle.