So, I noticed something. Just after the man in the moon brings Jack back to life, and he rises up through the ice, he breathes out a few times, and you can SEE his breath, like any human’s… but it gets a little fainter every time, and after the third breath it’s never visible again.
It’s like we’re seeing his body grow cold. Seeing the last, little, bit of his humanity fade.
Seeing the exact moment Jack lost… everyone.