Red-Gold Dragon

Fought the red-gold dragon in Eryn... er.. whatever the new wood-elf home is called, sang tranquil to stop the fight, slept maybe four hours or so, woke up and he was gone, leaving me in the locked room. Is that supposed to happen? I could quit out and come back later to the same mob restored and fight all over again, but until I do, the room is locked from the inside and the lock is "beyond your comprehension".