It was as though his mouth had a mind of its own. As if he'd been unwittingly made the victim of a rather powerful Imperius Curse. Weasley was on his back, upended under the force of a shockingly well-placed right hook, but Draco didn't even have time to gloat. Instead, he loomed, words tumbling from his mouth, entirely unchecked:

"You speak to her like that again, Weasley, I swear, I will end you. Do you hear me?"