[ He can see why it might be intimidating if that's the case. The water may be still, but the pool does get deeper further in. ]

It's unlikely that you'll have a better time to learn. [ A gentle way of saying that he worries it's a skill she may need when the water isn't so calm.

Thor tilts his head, considering. The young woman is his comrade - he ought to help if he can. ] I can teach you, if you wish. If you are in any danger, I'll see you safely back to shore.