P Headshot
Passive
Innate: Caitlyn's basic attacks generate a stack of Count on-attack, doubled if she is within brush. At 5 stacks, or 4 while in brush, her next basic attack consumes all stacks on-attack to become a Headshot.
Headshot: Caitlyn's basic attack is empowered to have an uncancellable windup and deal bonus physical damage, increased to against non-champions.
Enemies that step over a Yordle Snap Trap or are hit by 90 Caliber Net can grant an additional Headshot against them at 1300 range within 1.8 seconds, without consuming stacks. Each method grants only one Headshot at a time.