There is an explanation for fighting upside down in "Ghost Blowing the Lamp". "Dou Dou" means tomb robber. There are also many titles such as "Mojin Xiaowei" and "Moshan Taoist". The history of this profession has developed along with the history of China. Since the beginning of slave society, there has been a custom of placing items in tombs with them. From monarchs and nobles to ordinary people, they will put things they liked during their lifetime in the tomb of the deceased. I think that after death, people will still be able to use these things when they live in another environment. The only difference was the thickness of the burial objects. When something is buried in the soil, there are also people who take it out of the soil. Then the first person to take things from the tomb became the originator of the "inverted bucket" people. Unfortunately, there is no way to verify who that person was.
In the later feudal society, people were bewitched by superstitious ideas. The theory of people ascending to heaven after death has existed throughout the history of China, from ancient times to the present. The burial objects of various dynasties and generations have become more and more popular. Moreover, the architectural layout of the tomb is becoming more and more sophisticated. However, the Tao is one foot high and the devil is one foot high. No matter how rigorous and thoughtful the tomb's anti-theft construction is. As long as it is discovered, it will be stolen. It wasn't until later that he evolved into a certain overlord who was famous in history. The army was set up to dig up the ancient tombs of ancestors in order to pay for the army. Thus, the origin of "touching the golden captain" came into being. Before the liberation, the skill of "inverted bucket" was already perfected. With a Luoyang shovel, one person could enter and exit an ancient tomb in one night with no disadvantages.
Inverted fighting is a special industry. It is said that in the early days, there was a unique code word. Others would not understand it at all, but if they are two expert in inverted fighting who understand this code word, they will not understand it at all. You can hear it clearly, it seems to be a kind of culture. As an industry, reverse fighting has also formed ancient rules for reverse fighting, and people who do reverse fighting generally strictly follow these ancient rules.