Yasuo Ability (LoL): Steel Tempest

Yasuo thrusts, dealing 20 / 45 / 70 / 95 / 120 (+1.0 per attack damage) physical damage. If he hits, he gains a stack for 6 seconds. While he has 2 stacks, his next use of this ability fires a whirlwind from range, dealing the same damage and knocking up for 0.75 second. If used while dashing, this ability strikes in a circle rather than a stab.