We know there was a fight, not just an ambush, and that Zagi was taken down by a clawed creature. Unfortunately, we're stalled trying to prove who the one with such a power was. Not to mention the duct tape disaster in the library. It might have been an attempt at some kind of ritual, or just to distract the Kingmaker so he'd have to clean up the mess and the one who did it could get to something against the rules or try to break out.