“‘You - will - never - touch - our - children - again!’ screamed Mrs. Weasley.
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.

(via mydraco)