You expend some of your rage to throw one opponent at another.
Benefit: While raging, when you attempt a bull rush combat maneuver, you can spend 1 additional round of your rage as a swift action to add your Constitution bonus on your combat maneuver check to the bull rush. Further, if you bull rush an opponent into a square another creature occupies or into a solid object, the opponent and the creature or object take bludgeoning damage equal to your Strength modifier + your Constitution modifier.
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.