had to discard the option of placing our knapsacks on our heads and letting ourselves drift to the other bank. But even if she could swim, I doubt we’d have gone ahead with that method. We had no way of knowing what could be submerged beneath these fast-flowing waters. I once heard the story of an able-bodied man trying to swim across some jungle stream only to be impaled through the neck by a piece of wood. I myself had once waded chest-deep through a flash flood, and besides having to fight against the current with all my strength, had to step with both feet on bamboo thorns underwater; by the time I reached the bank, I was in pretty bad shape. Our eyes couldn’t assess the danger of such waters.