But Neville was clearly steeling himself to do something desperate.

"I won't let you do it," he said, hurrying to stand in front of the portrait hole. "I'll — I'll fight you!"

"Neville, "Ron exploded, "get away from that hole and don't be an idiot —"

"Don't you call me an idiot!" said Neville. I don't think you should be breaking any more rules! And you were the one who told me to stand up to people!"

"Yes, but not to us," said Ron in exasperation. "Neville, you don't know what you're doing."

He took a step forward and Neville dropped Trevor the toad, who leapt out of sight.

"Go on then, try and hit me!" said Neville, raising his fists. "I'm ready!"

Harry turned to Hermione. "Do something," he said desperately.

Hermione stepped forward. "Neville," she said, "I'm really, really sorry about this." She raised her wand.

"Petrificus Totalus!" she cried, pointing it at Neville.

Neville's arms snapped to his sides. His legs sprang together. His whole body rigid, he swayed where he stood and then fell flat on his face, stiff as a board.

Hermione ran to turn him over. Neville's jaws were jammed together so he couldn't speak. Only his eyes were moving, looking at them in horror.

"What've you done to him?" Harry whispered.

"It's the full Body-Bind," said Hermione miserably. "Oh, Neville, I'm so sorry."

"We had to, Neville, no time to explain," said Harry.

"You'll understand later, Neville," said Ron as they stepped over him and pulled on the invisibility cloak.

But leaving Neville lying motionless on the floor didn't feel like a very good omen. In their nervous state, every statue's shadow looked like Filch, every distant breath of wind sounded like Peeves swooping down on them.