Tiny little Professor Flitwick, the Charms teacher, was sitting on a large pile of cushions beside Professor Sprout, the Herbology teacher, whose hat was askew over her flyaway gray hair. She was talking to Professor Sinistra of the Astronomy department. On Professor Sinistra’s other side was the sallow-faced, hook-nosed, greasy-haired Potions master, Snape — Harry’s least favorite person at Hogwarts.