This is like a strange crossover between what could happen in the Heroes canon right now and what happened in the Five Years Gone Timeline.
And...it's...heartbreaking ;///;
Nice shout-out to Tim Kring's original idea of the brothers as twins (I'm guessing you read the very first version of the script, in which they're twins and Nathan says to Peter he's his better half. And then he says he loves him. Yeah, that was supposed to be on the pilot, my god.), and nice work all around.
God, it's so...terrible. He really can never be whole again. Oh, Peter. Peter. Oh.