He uses Explosive Arrows. It helps to be a level 15, because at level 15 is when a lot of helpful skills like Healing, Regenerate, Thousand Strikes and Explosive Arrows unlock. Take any armor and dexterity potions you have, and run away and heal after you take your first hit.
If you can survive, it might be helpful to close to melee range so he pulls out a sword instead of using explosive arrows on you.
