I agree with Spes Magna Mark. All perfect tactics and let him enjoy the character.
If it's being over-used, routne, non-challenge, etc., sunder the weapon in the dungeon or wherever for a battle or two.
Remember there's a limit based on his dex. Once he's used up the amount in a combat round, he can no longer use it that round.
As well, there's always other challenges such as a barbarian with a low Will save is subject to spells.