Byleth is fine thankfully, he surfaces, though his hair is a sopping curtain over his eyes now. He just kind of starts to paddle his way toward Dimitri. How can he even see like that? Don't worry about it.

"That was awesome!" He says excitedly. Well, excitedly for Byleth which is a soft pitching up of his voice. He paws a bit clumsily for Dimitri in the water. He's not particularly a strong swimmer but he gets by well enough.