I might drown myself anyway, watching you swim. Might forget to breathe, or something.

[He tugs lightly on the brim of his hat, a classic tell of vague embarrassment, but this one manages to escape being mortified and stays more in the realm of just sheepish. No point in trying to pretend like he isn't a gigantic fish nerd.]

No problems with the sand being too unsteady for you to move around on. No limits to your dive, for you — with these gills, you could probably explore underwater for hours. See what's down there on the bottom. Reproduce it for me on the surface so I can see it too...