But some part of him realized, even as he fought to break free from Lupin, that Sirius had never kept him waiting before. . . . Sirius had risked everything, always, to see Harry, to help him. . . . If Sirius was not reappearing out of that archway when Harry was yelling for him as though his life depended on it, the only possible explanation was that he could not come back. . . . That he really was . . .
J. K. RowlingYou see, I, unlike you, have been made a prefect, which means that I, unlike you, have the power to hand out punishments.” “Yeah,” said Harry, “but you, unlike me, are a git.
J. K. RowlingMad Eye' Moody on the Avada Kedavra curse: "Not nice," he said calmly. "Not pleasant. And there's no counter curse. There's no blocking it. Only one known person has ever survived it, and he's sitting right in front of me.
J. K. RowlingYou - will - never - touch - our - children - again!' screamed Mrs. Weasley. Bellatrix laughed, the same exhilarated laugh her cousin Sirius had given as he toppled backwards through the veil, and suddenly Harry knew what was going to happen before it did. Molly's curse soared beneath Bellatrix's outstretched arm and hit her squarely in the chest, directly over her heart. Bellatrix's gloating smile froze, her eyes seemed to bulge: for the tiniest space of time she knew what had happened, and then she toppled, and the watching crowd roared, and Voldemort screamed.
J. K. Rowling