Ylva had come to swim, because if nothing else it was something different, something to get her mind off of... well, everything. This is a perfectly reasonable thing to do.

And for a moment, she stares at Wayne on the bottom of the pool, wondering if he's okay. Maybe this is normal? Unsure. She shifts into the shape of a river otter, a favourite of hers for aquatic situations, and slips down under the surface to investigate, swimming gracefully down to look him in the face.