(He's not a big fan of swimming, humanly or any other way, but this is actually kind of relaxing, comparatively. He thinks.

He is not cut out for talking people into things. If she won't take his advice he should just give up and — leave —

This is no longer an immediately serious personal safety problem. This is a “who raised this child like this” problem. This is even less his field than diving. He should ask for help.

He starts composing an explanation of the situation.)