If you have mobs still attacking Kovok when you finish the 200 (and get auto-teleported out of him), you will be stuck in combat and there's NOTHING YOU CAN DO. I tried invising, mounting other players, alt F4ing (since I can't log/exit in combat...) and I WOULD try hearthstone, but it's set to the Klaxxi Dailies...
PS: This has happened before. Took over an hour for it to go away. PLEASE FIX THIS ABOVE ALL OTHER BUGS.
PPS: I don't know why I didn't think of this, but dying (obviously) fixes it, but I shouldn't HAVE to kill myself to fix a bug...
Edit: Dying only fixes the problem until you re-enter combat... -_-;
Update: Want to know something worse than being stuck in combat?
Being stuck in combat WHILE DEAD: http://i.imgur.com/uqN8Q.jpg
Blizzard, I'm about to throw my chair out of my window... ¬_¬;