A beautiful girl fell into a city moat as a result of a careless step. She was swept by the currents to a broken fence of a bridge arch in the moat, which caught her dress and temporarily halted her. As the currents were rapid and the water surface two or three meters below the ground, it would be hard to rescue her and even harder for the rescuer to climb up to safety. None of the passers-by dared to run the risk.