It doesn't make a lick of sense to me either. Maybe they just don't like having share with us.

And the turtle is the island. The rest of them are all stuck together like some big turtle shell continent. I think they're dead already. We've stopped at a port once since I've been here, but it was freaking. They didn't even have any kids around.

[And now he's wondering if he should tell him about the sword he picked up. But then...this isn't a secure channel. He'll talk to him about it face-to-face.]