"Nah, better to stick together. That way if the monsters try to eat us, I can push you at them and run."

He grins, showing that he doesn't mean it, except of course he sort of does. If there are real monsters, and if they come to attack, Josh will probably - well, really, just run or get eaten, he's not sure he quite has it in him to sacrifice someone else. But he's not sure that he doesn't, either. This all might not be real at all, so what would it matter, then?