[Swimming can indeed be a release. He isn't ignorant of what Xie Lian is doing - making sand castles is practically a national pastime where he comes from - but the comment on swimming itself is what catches his attention.]
Have a care while you swim. Not everything in the water is tolerant of company.
[It's spoken mildly, a simple comment rather than a warning or a threat.]
un: iudex
Have a care while you swim. Not everything in the water is tolerant of company.
[It's spoken mildly, a simple comment rather than a warning or a threat.]
Though I share your view on the activity.