With a whistle and a gesture of his hand, Ka-Vara commanded his daedra to distract the necromancer's abomination. While distracted, Ka-Vara would then flank the abomination, climb onto its back, and slam his steel maces into the abomination's head until the thing went down or it could throw him off.

Daedra's Actions: Distract the abomination.
Ka-Vara's Actions: Climb onto the abomination's back and play it's head like a drum.