@Volttekka Something like that, yeah. I think they were basically selling some basic stuff from their world, exchanging gold/silver/whatever in the room for Yen, buying more shit in Japan to sell, and so on.
@Hitspark It's literally magic, physics as we know it may not always apply. Or the author's a dummy, that happens too. Could also be a poor artist rendering of it if it was explained better in the original, like controlling the wind with magic rather than firing it from his own hands. This same sort of scene was quite excusable in Avatar because they were basically just redirecting things around them.