Professor Lupin gave a small sigh and took out his wand.
“This is a useful little spell,” he told the class over his shoulder. “Please watch closely.”
He raised the wand to shoulder height, said, “Waddiwasi!” and pointed it at Peeves.
With the force of a bullet, the wad of chewing gum shot out of the keyhole and straight down Peeves’s left nostril; he whirled upright and zoomed away, cursing.
“Cool, sir!” said Dean Thomas in amazement.
“Thank you, Dean,” said Professor Lupin, putting his wand away again. “Shall we proceed?”
They set off again, the class looking at shabby Professor Lupin with increased respect. He led them down a second corridor and stopped, right outside the staffroom door.
“Inside, please,” said Professor Lupin, opening it and standing back.
The staffroom, a long, paneled room full of old, mismatched chairs, was empty except for one teacher. Professor Snape was sitting in a low armchair, and he looked around as the class filed in. His eyes were glittering and there was a nasty sneer playing around his mouth. As Professor Lupin came in and made to close the door behind him, Snape said, “Leave it open, Lupin. I’d rather not witness this.”
He got to his feet and strode past the class, his black robes billowing behind him. At the doorway he turned on his heel and said, “Possibly no one’s warned you, Lupin, but this class contains Neville Longbottom. I would advise you not to entrust him with anything difficult. Not unless Miss Granger is hissing instructions in his ear.”
Neville went scarlet. Harry glared at Snape; it was bad enough that he bullied Neville in his own classes, let alone doing it in front of other teachers.
Professor Lupin had raised his eyebrows.
“I was hoping that Neville would assist me with the first stage of the operation,” he said, “and I am sure he will perform it admirably.”