A young man floats out of the water, bathed in the intense moonlight. This is JACK FROST - thin, pale, barefoot, his tousled hair frosted white.
((I just want to point out that in the left gif, there is a puff of white frosted breath coming from Jack’s mouth. This is something that happens when moist warm breath collides with cold air. I’ve met a lot of people who describe Jack as being freezing cold inside but, if that were the case, his breath would be cold and would not be visible like this. Just saying.))
(There’s also the possibility that this is because he’s JUST risen, though. Since I don’t think we ever see a warm breath come out of him past this point? I was always under the impression that that was Jack exhaling his last normal, human breath as he takes his first new one.)
((I really agree with youhavetobelieveinme’s theory. After all, if you look at the scene where Jack is in Antarctica—the coldest continent on Earth—Jack’s breath doesn’t come out in puffs of frost. And in that scene, he’s fighting Pitch and panting and breathing quite heavily. Even in this gif alone, we can see the warmth slipping. As Jack continues to pant, the frost gets thinner and thinner, and eventually dissipates.
So taken as a whole, it would make sense that Jackson Overland breathes his last breath in this scene, and Jack Frost breathes his first breaths in this scene. It is a rebirth scene, after all. It’s a baptism by fire—or, in this case, ice—almost. Gone is the warm, burning humanity, and in its place, there’s frost: playful, beautiful, and timeless. Which, when worded like that, sounds really dark, but it fits Jack really, really well.))
This fandom comes up with beautiful ways to describe things. I never would have noticed a detail like that, I’m glad I found this thread to point it out.