I'm doing the quest for the college where I go in the dwarven ruins. Long story short *POSSIBLE SPOILER AHEAD* I'm at the part where the guy opens the door and starts shooting lightning at you. Well, I've gotten him down to 0 health twice....in a row and he just doesn't die. All of a sudden a flame atriarch or whatever it is showed up....not sure where that came from.

Anyway, what the hell is going on??