As a body guard, I had no issue beating him. Actually the fight was pretty long, but I manage to beat him. I did use every single type of defense there is to use (shield, medpack, self heal etc) but still beat him at the end on the first try.
Kiting helps A LOT!
as a bodyguard (healer) you should NEVER go toe-to-toe against a melee. that is just bad news