"Again, I'm sure you aren't the first person who didn't want to die, and yet, people die," the Healer said. "I don't know what we can do for you, but I'd like for you to stay here a little longer before we discharge you, and hopefully we can figure out what caused this."
Percy's frown became deeper. "You don't know what you can do for him?" he repeated slowly. "What kind of Healer are you? You're supposed to cure people, not wonder."
The Healer shrugged. "I'm sorry, Mr. Weasley, but the truth is that magic is supposed to work instantly or close to it, a day, maybe two. Once we deal with comas, we can't explain what happens, and Mr. Vaisey's coma is even stranger than what we've seen in other purebloods. I know you'd like something more concrete, but there is nothing else I can tell you."