An opponent you have pinned is easy for you to knock out.
Benefit: While you have an opponent pinned, when you succeed at a grapple combat maneuver check to deal an opponent nonlethal damage using an unarmed strike or a light or one-handed weapon, double your damage result. Any creature that is immune to critical hits is immune to the effects of this feat.
Pathfinder Roleplaying Game Ultimate Combat. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.