Listen, we're going to sell the first bid. In the past, planting grass on objects or people was a sign of sales. Selling a straw hat is selling your life with a straw hat on your head. From the twenty-fifth chapter of the Romance of the Three Kingdoms, three things about the Tuntushan Pass Convention were omitted. Cao Cao looked up and said, "My opinion of Yan Liang is like selling the first ear!"

Here, Guan Yu thinks that Yan Liang's strength is not worth mentioning. Playing against himself is tantamount to putting a straw hat on his head. The outcome is decided, but he just sold his life.