The more interesting detail was the prints on the landward side. They had unmistakably been made by a quadruped. He was less experienced at analyzing an animal’s gait by its tracks, but his gut told him that it was running. The prints looked kind of horse-like, but that wasn’t the interesting detail. No, the thing which had him flummoxed was the way the prints ended in a skid . . . and then nothing. Nothing at all. Just undisturbed sand all the way to the horizon.