But exactly what was wonderful about Arithmancy, Harry never found out. At that precise moment, a strangled yell echoed down the boys¡¯ staircase. The whole common room fell silent, staring, petrified, at the entrance. Then came hurried footsteps, growing louder and louder ¡ª and then Ron came leaping into view, dragging with him a bedsheet.
¡°No, I'm not!¡± said Harry.
Snap picked up the Zonko's bag.
Crabbe blundered forward, his long arms outstretched like a zombie. Harry dodged around him, picked up a stick, and lobbed it at Crabbe's back. Harry doubled up with silent laughter as Crabbe did a kind of pirouette in midair, trying to see who had thrown it. As Ron was the only person Crabbe could see, it was Ron he started toward, but Harry stuck out his leg. Crabbe stumbled ¡ª and his huge, flat foot caught the hem of Harry's cloak. Harry felt a great tug, then the cloak slid off his face.
Snape had picked up the map. Harry tried with all his might to keep his face impassive.
Harry and Hermione looked at each other.