Felling Escape

Combat

Through the use of fluid contortions and manipulations of leverage, you can throw your opponent to the ground after escaping a grapple.

Prerequisite: Int 13, Combat Expertise, Improved Trip.

Benefit: When you break an opponent’s grapple with a combat maneuver check or Escape Artist check, you can spend a swift action to make a trip attempt against that opponent.

Source: Ultimate Combat