Well. See, there're these little creatures out there, they're like sprites of the fours elements of Nature. Ignis - the one who represents fire - flies around keeping the living creatures warm during cold Winter nights. That's what he's doing one night like any other, except this time, he notices the animals seem to be having trouble breathing. But what's he to do about that? He does try to think of a way to help them, but he really doesn't know what to do, so he carries on floating about the forest, doing what he can - keeping the others warm.
It's when he comes to a clearing and flies above a frozen lake that he sees something. Something moving underwater. That shouldn't be so surprising, but Ignis is a curious one, so he gets closer to the surface to investigate. He doesn't see anything at first, but the Aer pops up in front of him. Or well, below him, under the ice. She's the air sprite, and Ignis is immediately drawn to her. He realises she's trapped under the ice, so he tries to help her get out. But nothing works; he tries to pick up tree branches to break the ice, but by the time he gets there, all he carries in his hand is a pile of ashes! Again, he doesn't know what to do, so he goes back to Aer, his head down in an apology. She doesn't blame him though, instead reaching out a hand to the ice wall between them in understanding, her eyes closed. He does the same.
None of them notice the layer of ice starting to slowly melt.