The original intention is to assume that a crocodile bite your feet, and if you try to break free from your feet, the crocodile will bite your feet and hands at the same time. you are more struggling, bitten more tightly, So, if the crocodile bite your feet, the only way is to sacrifice one foot. The alligator principle in the stock market: when you find your trading deviating from market direction, you must immediately stop loss, without any delay by any fluke.