If ap was over a certain level (34 I think), he would have had the bloodlust spell. That makes him much better at hitting in melee.

Also, if you don't know a weapon well, you won't parry it nearly as well. It is therefore worth practicing every weapon so that you can parry that kind of weapon better. Start with the ones that are more commonly used.

Also, when he summons you, it lags him for a round (he can't do anything for a round afterwards). One thing I like to do is just to walk off, and make him waste mana summoning again and again. Then make a run for it.