The trader who successfully shorted during the 2008 subprime mortgage crisis, many people might feel nervous when they see his name. But a closer look at his trading history reveals that this guy has also had his share of failures. For example, his short position on Tesla was a harsh lesson from the market. This precisely illustrates a truth: no matter how skilled a short seller is, they cannot guarantee to always catch the market rhythm perfectly. An impressive historical track record does not necessarily mean future success; in fact, past glory can sometimes cause people to lose the necessary caution. Investors should be cautious when following trends and also carefully analyze the market itself.