Weapon Sacrifice (Ex)Source Weapon Master's Handbook pg. 19
When damage would cause the fighter or an adjacent ally to be knocked unconscious or killed, as a swift or immediate action the fighter can instead direct the damage to a weapon from the associated weapon group that he is wielding. The original target takes no damage, but the weapon receives only half its normal hardness. The fighter can use this option a number of times per day equal to the fighter’s weapon training bonus with the associated weapon group. He cannot use this option with unarmed attacks.