Hiro is naturally a snarky little shit joker, so it's 100% due to Sam's kidding around that he isn't currently hiding in his new room and refusing all social contact. Rather, he's chugging down the rest of his soda, burping loudly (gross) and giving the woodblock a curious look.

Well. Time enough to ask later. Now they're going places and hopefully getting stuff. Hiro wants to ask a million questions -- are they going to ride on that weird skidoo thing? How are they going to carry everything? What are they going to barter with, considering the whole no-currency thing?

But he sticks to: "Back-up?"