[As someone from a world with an actual sea witch who makes actual deals including with dumb teenagers (as much as she tries to avoid it), Simon is going to be the adult here; a man with gills and a standard fish-tail grabs for Izuku's arm.]

He's not interested at the moment.

[time to steer the child away... Simon isn't used to fins, but is used to undersea architecture, so can navigate better than most in the simulation]