The abrupt change of expression was strange, but she supposed Professor... Mister Snape had little desire to be faced with one of his former students. Still...
"My apologies, Mister Snape," Padma said. She kept her smile up, but looked closely at him. He wasn't exactly as she remembered. She reminded herself that she hadn't seen him in years; she probably looked different to him as well.
"Congratulations on your retirement. I'm sure it's a pleasure not to worry about exploding cauldrons anymore."
She tilted her head thoughtfully, still not sure that everything was as it seemed. "Is there a particular book you were looking for? We have a wide selection of both Magical and Muggle books, and if there's anything we don't have, I would be happy to order it for you."