What is the function of "inverted stick"?

What is the function of "inverted stick"?

Miao Xiyong said in the "Sutra of Funeral Sutra Wing·Inverted Rod": "For those who have an inverted rod, it is also important for the funeral to set up the coffin in a cave." Putting the rod in an inverted coffin is the last step in feng shui. The key link, even if the shape is good and the burial method is wrong, the previous work will be abandoned. Guo Pu's "Burial Scriptures" said that "the auspicious auspicious burial is the same as the abandoned corpse", which refers to this. So put the coffin in the acupuncture point, avoid hurting the pulse, leaving the pulse, the depth is not distinguished between dry and wet, and there must be no deviation from the low and shallow, otherwise it is not only bad, but also fierce.