Duration is one non-combative round or three combative ones. Then consult Weapon Flies Away at Fumbles. Disarm Two-Handed Weapons Normal Called Shot. Two disarms at same round can send the weapon away, but just for 1d6 feet. Disarm Shields Normal Called Shot.
Bucklers can even fly away as well.
You can send the weapon to anywhere you want. If you hit, the attack is then blocked. You loose all your actions this round as well. Pin Normal Called Shot. At other rounds he gains one free Str check try against you without wasting his actions.