Happiness seemed to radiate from Dumbledore

Happiness seemed to radiate from Dumbledore like light; like fire: Harry had never seen the man so utterly, so palpably content.

“Explain,” said Harry.

“But you already know,” said Dumbledore. He twiddled his thumbs together.

“I let him kill me,” said Harry. “Didn’t I?”

“You did,” said Dumbledore, nodding. “Go on!”

“So the part of his soul that was in me…”

Dumbledore nodded still more enthusiastically, urging Harry onward, a broad smile of encouragement on his face.

“… has it gone?”

“Oh yes!” said Dumbledore. “Yes, he destroyed it. Your soul is whole, and completely your own, Harry.”

“But then…”

Harry trembled over his shoulder to where the small, maimed creature trembled under the chair.

“What is that, Professor?”

“Something that is beyond either of our help,” said Dumbledore.

“But if Voldemort used the Killing Curse,” Harry started again, “and nobody died for me this time – how can I be alive?”

“I think you know,” said Dumbledore. “Think back. Remember what he did, in his ignorance, in his greed and his cruelty.”

Harry thought. He let his gaze drift over his surroundings. If it was indeed a palace in which they sat, it was an odd one, with chairs set in little rows and bits of railing here and there, and still, he and Dumbledore and the stunted creatures under the chair were the only beings there. Then the answer rose to his lips easily, without effort.

“He took my blood,” said Harry.

“Precisely!” said Dumbledore. “He took your blood and rebuilt his living body with it! Your blood in his veins, Harry, Lily’s protection inside both of you! He tethered you to life while he lives!”

“I live… while he lives? But I thought… I thought it was the other way around! I thought we both had to die? Or is it the same thing?”

He was distracted by the whimpering and thumping of the agonized creature behind them and glanced back at it yet again.

“Are you sure we can’t do anything?”

“There is no help possible.”

“Then explain… more,” said Harry, and Dumbledore smiled.

“You were the seventh Horcrux, Harry, the Horcrux he never meant to make. He had rendered his soul so unstable that it broke apart when he committed those acts of unspeakable evil, the murder of your parents, the attempted killing of a child. But what escaped from that room was even less than he knew. He left more than his body behind. He left part of himself latched to you, the would-be victim who had survived.”