Harry tried not to laugh as he watched ash mens sneakers Malfoy hurry forward, his head drooping with the weight of a nose like a small melon. As half the class lumbered up to Snape's desk, some weighted down with arms like clubs, others unable to talk through gigantic puffed-up lips, Harry saw Hermione slide back into the dungeon, the front of her robes bulging.
When everyone had taken a swig of antidote and the various swellings had subsided, Snape swept over to Goyle's cauldron and scooped out the twisted black remains of the firework. There was a sudden hush.
“If I ever find out who threw this,” Snape whispered, “I shall make sure that person is expelled.”
Harry arranged his face into what he hoped was a puzzled expression. Snape was looking right at him, and the bell that rang ten minutes later could not have been more welcome.