Savage (Ex): If a brachyurus successfully trips an opponent, it latches onto the opponent's body and tears the flesh. This automatically deals an additional 15d6+25 points of damage. If an opponent goes prone for any reason (perhaps as the subject of another brachyurus's Improved Trip attack) in an area the brachyurus threatens, the brachyurus can also savage the victim as a free action (treat as the brachyurus's attack of opportunity for the round), even though it had nothing to do with tripping the foe.