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Squash Flat (Combat)

Source Inner Sea Gods pg. 216, Faiths of Corruption pg. 25
You can bull rush an opponent straight to the ground.

Prerequisites: Improved Bull Rush, Merciless Rush, worshiper of Rovagug.

Benefit: Whenever you make a bull rush attack and your combat maneuver check exceeds the target’s CMD by 5 or more, you can attempt to trip the target as part of your bull rush as a free action. This does not provoke an attack of opportunity.

Combat Trick (from the Combat Stamina feat)

Source Weapon Master's Handbook pg. 25
After succeeding at a bull rush combat maneuver check, you can spend 4 stamina points to attempt to trip the target with Squash Flat regardless of your bull rush combat maneuver check’s result.