"Well, Draco and I assume that Dumbledore had been cursed when he destroyed the ring." She pointed at the table with the books. "We found a copy of that in his office and he marked a certain page about curing the deadliest of curses, the ones that people use to protect the most valuable things they have." Harry stared blankly at her. "If our theory is correct, then he was dying, Harry... That doesn't make his death less tragic but it makes hunting You Know Who's souls more difficult."