Raging Torrent ~against the stream~

Goku and Gojyo are complaining about the heat, Goku saying how he'd love to cool off in a river somewhere. Hakkai checks the map: as it happens, they're just about to come to one. And so they do, but there's no bridge, nor boats available. A local kid tells them they won't be able to cross the river, but dashes off without saying why.