Knocking Blows (Armor Mastery)

The weight of your blows overwhelms your opponents.

Prerequisite(s): Str 13, Intense Blows, Power Attack, Base attack bonus +11 or fighter level 8th, armor training class feature, proficiency with heavy armor.

Benefit(s): If you hit a creature that is no more than one size category larger than you with a Power Attack, the creature you attacked is also knocked off balance. Until the beginning of your next turn, it takes a –4 penalty to its CMD against combat maneuvers that move it or knock it prone.