"I'm glad to help! It's actually kind of nice having someone else in the water with me."

And he's even glad to have something to show this guy...though Luca's not entirely certain he can make it there safely. He'll have to keep a close eye on him in case he gets in trouble in the water.

"I do! I don't know how you can stay underwater, though, so I don't know if you can make it there, but I can try to show you and we can turn back if it's too far!" Then, realizing he hasn't introduced himself, Luca adds, "My name's Luca, by the way."