Skulking Strike
[reaction]
Feat 13
Source Player Core pg. 81
Prerequisites Underfoot
Trigger An enemy occupying the same space as you uses a manipulate action or a move action, makes a ranged attack, or leaves a square during a move action it’s using.
You launch a surprise attack from below. Make a melee Strike against the triggering creature. If your attack is a critical hit and the trigger was a manipulate action, you disrupt that action. This Strike doesn't count toward your multiple attack penalty, and your multiple attack penalty doesn't apply to this Strike.