Harry found himself raising a hand to his throat unconsciously; he struggled to meet Hermione’s eyes, "This," he said, his voice breaking slightly, "this didn’t happen last time. The injury to my throat? It’s cursed, and it reactivates in the presence of dark magic. It’s barely healed at all, despite all the treatments that Snape has attempted - I think it’s because I’m a Horcrux. Over the summer, Snape told me that... that if I were to survive the killing curse again, that I’d bleed to death pretty quickly afterwards," he felt Draco shudder behind him, and while Hermione had gone deathly pale, Ron only looked at him uncomprehendingly.