Talk:Chamber of Lament/@comment-18257985-20130914123108/@comment-5166842-20130914141745

That's normal. Each time you go in to fight him will last about 9 or 10 minutes, then he'll fly away. This gives you a chance to go restock on items and rest if you want, when you go back in the fight will pick up where it left off. He does not heal himself between sessions.