[He smiles at him fondly as he joins him (and, yes, what else is new) before turning back towards the water, not really aware that Keith continues to watch him. He looks peaceful, at least, even if maybe there's still that worry for Keith at the back of his mind, but-- well, that also requires patience.]
[He waits for a long while, waits for more fish to gather and for them to be close enough together, and then wordlessly Shiro lets his hand buzz with the familiar Galra energy and then quickly arcs his arm down into the water, sending out a blast of heated water towards the fish. It doesn't hit all of them, but hits enough that, stunned, they bob up to the surface a moment later.]
[Looks back at Keith with a triumphant little smile. See?]