Ancient boxing lethality?

China's three internal fist techniques, form and meaning, too advanced and gossip, can all cause internal injuries, but as you know, it's hard to find a real fist technique now. On lethality, both form and meaning should be counted, but it is also very strong to practice Tai Chi and Eight Diagrams to a high depth. The ancients said: if you don't go out for ten years, you will kill people in one year.

There is also the legendary psychological boxing, which is also called psychological boxing in Henan. The ancients also said: Tai Chi is treacherous, gossip is slippery, and the most poisonous is psychological boxing.