Wing Tsun is one of the few styles that have understood with great precision the importance of working with this reference system. Leung Ting states that since we are not Gorillas, nor bulls, we should find defensive ways in which force is not so important. Definitely, Chi Sao is the key to open that door, and Victor Gutierrez has taken the decision to open it. There are practical applications, of real combat, along with explanations of the operative foundations of Chi Sao. In a word, "the theory is seen in the practice", Sifu Gutierrez goes deep and awakens true passions among the practitioners of WingTsun.