"I have something at home, but I wouldn't mind taking this," he said — if he was lucky, he could figure out how to brew it himself, and start offering it to some of the fireworks-happy Quidditch players he sometimes had as clients. He listened patiently to Miss Whitby's instructions, and smiled when she was done.

"Thank you," he said, "I hope that next time I see you, it's under better circumstances."