Quick Block Buckler

Once per round as an immediate action, this +3 arrow deflection buckler can be used to block an incoming melee attack. When used in this way, the buckler's enhancement bonus increases by +2 against that attack. The buckler's user must decide to use this ability before the attack roll is made. When the shield's user blocks a melee attack in this way, it cannot use its arrow deflection special ability for 1 round.