Keeping Benhart alive may prove to be difficult, especially if he gets aggro. So you make sure you get Knights attention if Benhart's hp gets low. Or just go bananas and kill him before he kills Benhart.
"Formerly known as the Mirror Knight, this knight is clad in steel polished to a mirror finish. Wields a mirror shield which it can use to summon NPCs and players to fight against the player during the boss fight, as well as deflect spells that come in contact with the mirror."
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The Looking Glass Knight, also known as the Mirror Knight, is a boss in Dark Souls II. It can be...