Ruthless Opportunist (Combat, Teamwork)Source Inner Sea Races pg. 208
Your timing and fierceness take the enemy by surprise.
Prerequisites: Human (Chelaxian).
Benefit: When a Chelish ally with this feat hits with an attack of opportunity against an enemy both you and that ally are threatening, you gain a +2 circumstance bonus on your melee attack rolls against that enemy for 1 round.