Hermione had managed to free herself before the plant got a firm grip on her. Now she watched in horror as the two boys fought to pull the plant off them, but the more they strained against it, the tighter and faster the plant wound around them.

"Stop moving!" Hermione ordered them. "I know what this is — it's Devil's Snare!"

"Oh, I'm so glad we know what it's called, that's a great help," snarled Ron, leaning back, trying to stop the plant from curling around his neck.

"Shut up, I'm trying to remember how to kill it!" said Hermione.

"Well, hurry up, I can't breathe!" Harry gasped, wrestling with it as it curled around his chest.

"Devil's Snare, Devil's Snare... what did Professor Sprout say? — it likes the dark and the damp

"So light a fire!" Harry choked.

"Yes — of course — but there's no wood!" Hermione cried, wringing her hands.

"HAVE YOU GONE MAD?" Ron bellowed. "ARE YOU A WITCH OR NOT?"

"Oh, right!" said Hermione, and she whipped out her wand, waved it, muttered something, and sent a jet of the same bluebell flames she had used on Snape at the plant. In a matter of seconds, the two boys felt it loosening its grip as it cringed away from the light and warmth. Wriggling and flailing, it unraveled itself from their bodies, and they were able to pull free.

"Lucky you pay attention in Herbology, Hermione," said Harry as he joined her by the wall, wiping sweat off his face.

"Yeah," said Ron, "and lucky Harry doesn't lose his head in a crisis - 'there's no wood,' honestly."