Dumbledore sat back in his chair, "I am sure, Draco, that Harry has told you of how his mother’s sacrifice acted as a shield for him, and protected him against Lord Voldemort when he was a baby," Draco nodded dully, doing his shirt back up and flinching when his fingers brushed against the fresh wound, "I think it is safe to say that Harry, by standing between you and the Dark Lord, and willingly laying down his life for yours, created a similar protective barrier for  you - and when the Dark Lord attempted to do you harm, the curse rebounded,"