As has been said, make sure you clear the area first.  Also be careful he resets if walk back towards the building.  I had him at half life and reset, and starts evading but still doing damage. So take him towards Honor Hold, where he can't evade.  Another warning, if you walk away when he starts his whirlwind he chucks you away, possibly onto respawns.

I did use 2 major mana pots, 1 major healing pot and lots of bandages while he was stunned.  I used BoW.  Fight took about 6 minutes i think.

He has just under 21k Health and deals about 300 dmg per hit, he crit me for 750 at one time.

I have abt 120 dps, +250 spell dmg and +320 healing.