Your powerful and swift attacks can slice ranged attacks out of the air.
Benefit(s): When a ranged attack is made against you or a target adjacent to you, you can cut the weapon (or ammunition) out of the air, deflecting the attack so the target takes no damage. As an attack of opportunity, make a melee attack roll at your highest bonus. If the result is greater than the attack roll total of the ranged attack, the attack is deflected. You must be aware of the attack and not flat-footed. Unusually massive ranged weapons (such as boulders or ballista bolts) and ranged attacks generated by spell effects cannot be deflected.
Pathfinder Player Companion: Weapon Master’s Handbook © 2015, Paizo Inc.; Authors: Alexander Augunas and David N. Ross.