“Harry uttered an inarticulate yell of rage: In that instant, he cared not whether he lived or died. Pushing himself to his feet again, he staggered blindly toward Snape, the man he now hated as much as he hated Voldemort himself —“Sectum — !”Snape flicked his wand and the curse was repelled yet again; but Harry was mere feet away now and he could see Snape’s face clearly at last: He was no longer sneering or jeering; the blazing flames showed a face full of rage. Mustering all his powers of concentration, Harry thought, Levi —“No, Potter!” [...] Snape’s pale face, illuminated by the flaming cabin, was suffused with hatred just as it had been before he had cursed Dumbledore.“You dare use my own spells against me, Potter? It was I who invented them — I, the Half-Blood Prince! And you’d turn my inventions on me, like your filthy father, would you? I don’t think so . . . no!”
“But somebody else had spoken Snape’s name, quite softly.“Severus . . .”The sound frightened Harry beyond anything he had experienced all evening. For the first time, Dumbledore was pleading.Snape gazed for a moment at Dumbledore, and there was revulsion and hatred etched in the harsh lines of his face.“Severus . . . please . . .”Snape raised his wand and pointed it directly at Dumbledore. “Avada Kedavra!”A jet of green light shot from the end of Snape’s wand and hit Dumbledore squarely in the chest. Harry’s scream of horror never left him; silent and unmoving, he was forced to watch as Dumbledore was blasted into the air. For a split second, he seemed to hang suspended beneath the shining skull, and then he fell slowly backward, like a great rag doll, over the battlements and out of sight.”
“He picks up one of the tests and pretends like he's Harry Potter, aiming the test at random objects around the small bathroom yelling, "I curse you with my magic wand, punk toilet paper!”
“But Dobby shouted, "You shall not harm Harry Potter! ... He got up, face livid, and pulled out his wand, but Dobby raised a long, threatening finger. "You shall go now," he said fiercely, pointing down at Mr. Malfoy. "You shall not touch Harry Potter. You shall go now.”
“Harry Potter," he said very softly. His voice might have been part of the spitting fire. "The Boy Who Lived."None of the Death Eaters moved. They were waiting. Everything was waiting. Hagrid was struggling, and Bellatrix was panting, and Harry thought inexplicably of Ginny, and her blazing look, and the feel of her lips on his--Voldemort had raised his wand. His head was still tilted to one side, like a curious child, wondering what would happen if he proceeded. Harry looked back into the red eyes, and wanted it to happen now, quickly, while he could still stand, before he lost control, before he betrayed fear--He saw the mouth move and a flash of green light, and everything was gone.”
“Come out, come out, little Harry!" she called in her mock-baby voice, which echoed off the polished wooden floors. "What did you come after me for, then? I thought you were here to avenge my dear cousin!" "I am!" shouted Harry, and a score of ghostly Harrys seemed to chorus I am! I am! I am! all around the room. "Aaaaaah... did you love him, little baby Potter?"Hatred rose in Harry such as he had never known before. He flung himself out from behind the fountain and bellowed "Crucio!"Bellatrix screamed. The spell had knocked her off her feet, but she did not writhe and shriek with the pain as Neville had -- she was already on her feet again, breathless, no longer laughing. Harry dodged behind the garden fountain again -- her counterspell hit the head of the handsome wizard, which was blown off and landed twenty feet away, gouging long scratches into the wooden floor. "Never used an Unforgivable Curse before, have you, boy?" she yelled. She had abandoned her baby voice now. "You need to mean them, Potter! You need to really want to cause pain -- to enjoy it -- righteous anger won't hurt me for long -- I'll show you how it is done, shall I? I'll give you a lesson--!”