Finally, Hermione told Malfoy that Harry was also an unintentional Horcrux of Voldemort; she told him how Snape had revealed to Harry what he and Dumbledore had planned, and this was the reason why Harry didn’t die the second time Voldemort tried to kill him. "You-Know-Who killed not Harry but his own Horcrux that night, that’s why Harry survived," she finished.