They take Blaise back to Twelve Grimmauld Place with them because Moody doesn’t want him in Coventry. He’s sent a profanity-laced letter to Lupin saying so and demanding that Lupin send someone from Grimmauld to Coventry to "maintain personnel balance," he says. Lupin sighs and dispatches Terry Boot, a move which will no doubt make Padma Patil happy. Terry is gone before dark, and Lupin shows Blaise the tiny attic cubicle that will be his. "Not much better than what you left, probably," he says.