Bellatrix laughed the same exhilarated laugh her cousin Sirius had given as he toppled backward through the veil, and suddenly Harry knew what was going to happen before it did.
Molly’s curse soared beneath Bellatrix’s constreched arm and hit her squarely in the chest, directly over her heart.
Bellatrix’s glounting 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.
Harry felt as though he turned into slow motion: he saw McGonagall, Kingsley and Slughorn blasted backward, flailing and writhing through the air, as Voldemort’s fury at the fall of his last, best lieutenant exploded with the force of a bomb, Voldemort raised his wand and directed it at Molly Weasley.
“Protego!” roared Harry, and the Shield Charm expanded in the middle of the Hall, and Voldemort stared around for the source as Harry pulled off the Invisibility Cloak at last.
The yell of shock, the cheers, the screams on every side of “Harry!” “HE’S ALIVE!” were stifled at once. The crowd was afraid, and silence fell abruptly and completely as Voldemort and Harry looked at each other, and began, at the same moment, to circle each other.
“I don’t want anyone else to help,” Harry said loudly, and in the total silence his voice carried like a trumpet call. “It’s got to be like this. It’s got to be me.”