What a disappointment. After a very promising start with a frequent trading style, taking small profits but also cutting losses short the vendor all of a sudden lets a Crude Oil contract run up a huge loss in relation to the account size and his previous trading style. He replies to my question that the market will turn around for a big profit. A few minutes afterwards he changed his mind, takes the loss and reverses the trade - now he lets that trade also run into a big loss. Why do traders change their successful trading styles?