Opportunistic Grappler

While you are grappled (but not when you are
controlling the grapple), you can attempt a dirty
trick combat maneuver against the creature
grappling you without provoking an aoo or
taking a penalty on the combat maneuver check.
If you have Improved Dirty Trick, you gain a +2
bonus on attempting such a dirty trick, and the
condition the dirty trick imposes lasts for 1
round longer. This bonus stacks with the
bonuses granted by Improved Dirty Trick
and Greater Dirty Trick feats.