Mulciber is the one to cast the curse at Potter, made to eat away at his flesh, and kill him over twenty-four hours. Fortunately, they have a brilliant healer, and the Boy-Who-Lived survives. And then two days later, Mulciber is found hanging in the middle of Diagon Alley, and it's a clear message. Draco wonders if Potter realises it now, if he's accepted the fact that his childhood best friend truly was a cold-blooded killer.