Por que não todos? Em entrevista com a Time , Rowling explica que foi o três desses fatores:
Em primeiro lugar, foi de fato a proteção de Lily que o amarrou à vida. Ele também amarrava Voldemort, e se ele tivesse se arrependido por suas ações, ele teria sido "curado", e supostamente se tornaria um bom homem. É também o assunto da Varinha Ancestral, que pertencia diretamente a Harry. Não funcionou com força total, mas ainda enviou uma maldição poderosa o suficiente para destruir a parte da alma de Voldemort, e quase matou Harry, que escolheu para voltar.Rowling wrote this very carefully, so it could be read two ways. "Did he just go into a state of unconsciousness in which his subconscious tells him everything he needs to know? Dumbledore doesn't tell him anything he couldn't have figured out with some educated guesses." But in her mind, Harry entered a limbo between life and death, and faced a choice about which way to go.
She explains on her website that this encounter involves some very deep laws of magic, which Voldemort himself did not understand: "Having taken Harry's blood into himself, Voldemort is keeping alive Lily's protective power over Harry — except that the power of Lily's sacrifice is a positive force that not only continues to tether Harry to life, but gives Voldemort himself one last chance ... Voldemort has unwittingly put a few drops of goodness back inside himself; if he had repented, he could have been healed more deeply than anyone would have supposed. But of course, he refused to feel remorse." Also, since Voldemort is using the Elder wand, which actually belongs to Harry, neither the Cruciatus or the killing curse work properly. "The Avada Kedavra curse, however, is so powerful that it does hurt Harry, and also succeeds in killing the part of him that is not truly him, in other words, the fragment of Voldemort's own soul that is still clinging to his. The curse also disables Harry severely enough that he could have succumbed to death if he had chosen that path."