Wrist Cutter (3.5e Maneuver)

Drop the weapon, creep!

When you are attacked with a melee weapon, you can immediately make an attack of your own. This goes off before their attack. If you hit and deal damage, they must make a Concentration check equal to 10 + damage dealt or drop their weapon, negating their attack. If you miss, you are left open and you take a -4 AC penalty for 1 round.