Just from watching her, he can recognize there's something about the water that doesn't make it quite so crystalline, confirmed when she trails off mid sentence. It's not dangerous, or she would not have invited him in.

As she swims closer, he would never call her graceful - the idea is laughable - but there is an ease at which she moves herself through the water that he might like to find in himself again.

He smiles, faintly. "I believe you," he says, not for the first time. Cassian can't pinpoint when he started to believe in her, but he can't say he regrets it either. He kicks his shoes off, the sand cool on his toes. He already knows he'll step into the shallows at the very least, but it may take some effort to climb to his feet, so he just settles for watching her a little more first. He would much prefer this image of her standing at the water under the moon to be seared in his mind instead of her face halo'd by a burning planet. "Is it cold? I don't think you can stop me from freezing too."

It's teasing. Mostly.