Harry Potter e l'Ordine della Fenice

Harry did not answer at once. <…>
because he did not want to say what was in his mind.
The fact was that he had given the matter a great deal of thought over the past fortnight. Sometimes it seemed an insane idea, just as it had on the night Hermione had proposed it, but at others, he had found himself thinking about the spells that had served him best in his various encounters with Dark creatures and Death Eaters — found himself, in fact, subconsciously planning lessons. . . .

“I was wondering,” Hermione said suddenly, “whether you’d thought any more about Defense Against the Dark Arts, Harry.”
“’Course I have,” said Harry grumpily. “Can’t forget it, can we, with that hag teaching us —”

“Harry,” she said timidly, “don’t you see? This . . . this is exactly why we need you. . . . We need to know what it’s r-really like . . . facing him . . . facing V-Voldemort.”

He was suddenly so tired that he was tempted to sink back into his armchair and sleep there,

“Well, I’m off to bed,”

the most we could see him is during Hogsmeade weekends

Umbridge took a different tack in this class and wandered among the students, questioning them on magical creatures. Most people were able to answer well and Harry’s spirits lifted somewhat; at least the class was not letting Hagrid down.

can you tell me what is causing Professor Hagrid’s very extended leave of absence?”

“As I was saying, the Vanishing Spell becomes more difficult with the complexity of the animal to be vanished. The snail, as an invertebrate, does not present much of a challenge;

Professor Umbridge looked as though she had just been slapped in the face.