1) Dodge the arrows being cast right off the bat. When the timing's right, shoot/throw projectile at him. This part won't last long.

2) Now your arrows/axes are nothing. Start blocking and try to kill his friend as well. But you'll notice statues around. Try to get him attacking near one and he gets his sword stuck. Swoop in for the kill. He'll break free after a bit, then it's the same. Repeat till death.