I was doing some random quest for the vamps on dawnguard a minute ago, where I had to clear out the dungeon called Morvunskar because it was infested with feral vampires. First thing's first, I have already cleared this dungeon once and had no trouble with it that time around, so I just went steaming in thinking "oh this will be a walk..."
Well... I get to the end of the dungeon and walk into some sorta dining room to find the daedric prince Sanguine, beating on some mages and killing my target for me. When he finished killing the enemies, he turned on me and started smashing me in the face with some sorta mace. The weird thing is, none of his attacks did any damage to me and vice verse when I attacked him.
WTF? Has this ever happened to anybody else?