Usopp watched, blinking, but not feeling any alarm. Actually, it felt a little bit like a circus demonstration or something, 'see the blind man cut without touching his partner!' And it also seemed like something Zoro would do. He hadn't thought much about his nakama tonight... how were they doing? Were they making progress in the basement? What kinds of monsters were down there? Were they running off without Usopp like Nami had threatened on the board? He couldn't take that threat seriously, even if he'd argued with it through logic--that was just the way Nami was.

And carrying around a sword and slicing things other people hold out without fear was like Zoro. Maybe Sasuke, back home, could cut through all kinds of metals too. Or maybe this was a ninja thing...