QUOTE : Voldemort cannot kill Harry with any wand because in order for the Killing Curse to work, the caster has to mean it, and Voldemort doesn’t realize that he identifies with Harry too much, sees too much of Harry’s humanity, to kill him the same way he has killed others. But just in case, Harry—and the author—derive some support from the connection that the hawthorn wand and the Elder Wand now have. The Elder Wand has submitted to disarmament from the hawthorn wand once before. Harry is conscious of drawing on that parallel history as he casts his signature magic using Draco’s wand (emphasis mine).