Moody was speaking again, from a great distance, it seemed to Harry. With a massive effort, he pulled himself back to the present and listened to what Moody was saying.
“Avada Kedavra’s a curse that needs a powerful bit of magic behind it—you could all get your wands out now and point them at me and say the words, and I doubt I’d get so much as a nosebleed. But that doesn’t matter. I’m not here to teach you how to do it.
“Now, if there’s no countercurse, why am I showing you? Because you’ve got to know. You’ve got to appreciate what the worst is. You don’t want to find yourself in a situation where you’re facing it. CONSTANT VIGILANCE!” he roared, and the whole class jumped again.
“Now… those three curses—Avada Kedavra, Imperius, and Cruciatus—are known as the Unforgivable Curses. The use of any one of them on a fellow human being is enough to earn a life sentence in Azkaban. That’s what you’re up against. That’s what I’ve got to teach you to fight. You need preparing. You need arming. But most of all, you need to practice constant, never-ceasing vigilance. Get out your quills… copy this down…”
They spent the rest of the lesson taking notes on each of the Unforgivable Curses. No one spoke until the bell rang—but when Moody had dismissed them and they had left the classroom, a torrent of talk burst forth. Most people were discussing the curses in awed voices—“Did you see it twitch?”—“and when he killed it—just like that!”
They were talking about the lesson, Harry thought, as though it had been some sort of spectacular show, but he hadn’t found it very entertaining—and nor, it seemed, had Hermione.
“Hurry up,” she said tensely to Harry and Ron.
“Not the ruddy library again?” said Ron.
“No,” said Hermione curtly, pointing up a side passage. “Neville.”
Neville was standing alone, halfway up the passage, staring at the stone wall opposite him with the same horrified, wide eyed look he had worn when Moody had demonstrated the Cruciatus Curse.
“Neville?” Hermione said gently.
Neville looked around.
“Oh hello,” he said, his voice much higher than usual. “Interesting lesson, wasn’t it? I wonder what’s for dinner, I’m—I’m starving, aren’t you?”
“Neville, are you all right?” said Hermione.
“Oh yes, I’m fine,” Neville gabbled in the same unnaturally high voice. “Very interesting dinner—I mean lesson—what’s for eating?”
Ron gave Harry a startled look.
“Neville, what—?”
But an odd clunking noise sounded behind them, and they turned to see Professor Moody limping toward them. All four of them fell silent, watching him apprehensively, but when he spoke, it was in a much lower and gentler growl than they had yet heard.
“It’s all right, sonny,” he said to Neville. “Why don’t you come up to my office? Come on… we can have a cup of tea…”