An Auror shot them both in the head with potion rounds; the head rocked back, the spatter of potion sizzling as it mixed with the dried blood, but Arthur wasn't stopped by it. They don't have enough conflagration rounds, they are depending on the acid ones! His jaw was deep in Molly as he took a bite. Fleur flew over and point-blank shot him in the face, repeatedly, with fireballs from her hands until his head was charred and gone. He still tried to stagger over Molly as she died, still screaming.