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And what was the pitiful dying thing at the train station?
Don’t feel bad you didn’t understand this, lots of people didn’t. It didn’t have anything to do with the Elder Wand or the other hallows. It had to do with horcruxes.
Firstly, remember how a horcrux works. They’re a little bit of your soul trapped inside an object. As long as any bit of your soul resides on earth, you cannot die. Of course, continued living with a partial soul is something no sane person would think is worth it.
Now, this whole chain of events which concludes with the fight between Harry and Voldemort towards the end of Deathly Hallows really starts way back in the first book. Dumbledore tells Harry that his Mother sacrificed himself for him. We later learn that her love protection lives on within him, in his blood. He is protected as long as his mother’s sacrifice lives within him.
Then later, in Goblet of Fire, Voldemort, in his arrogance, makes a terrible (for him!) mistake. When he took Harry’s blood inside his new body, Voldemort extended Harry’s mother’s love into himself. He became, for all intents and purposes, a horcrux for Harry, because even if something happens to Harry, as long as Voldemort’s around, Harry’s protection from his mother lives on.
But at the same time, don’t forget, we’ve also learned that Harry was also a horcrux for Voldemort, made one inadvertantly the night Voldemort tried to kill Harry with the Avada Kedavra when he was a baby. When the AK backfired, a piece of Voldemort’s already badly damaged soul attached itself to Harry. That’s why Harry survived the AK, when no one else has done so, before or since.
So, they’re horcruxes for each other, neither can kill the other.
Also, remember Harry has destroyed all of Voldemort’s intentional horcruxes but one, the one inside the snake Nagini.
OK, so, now, here is the progression of what happens the night of the final battle between Harry and Voldemort:
We argued for years about the true meaning of “One cannot live while the other survives.” Turns out, JK meant it literally. Both had to die for Harry to live and the world to be free.