What does the fortune teller mean by Yin Jian _ What does it mean to commit Yin Jian?

What does the fortune teller mean by "committing a fierce sword"?

This is the technical term for fortune telling. The hedge of yang blade is called flying blade, also called Li Guangjian; The opposite of yin blade is called yin sword, also called forced soul sword. In ancient times, this statement was to persuade people to do more good deeds, but now fortune-telling is not talked about. Too feudal and superstitious. Now fortune-telling only talks about strength, preferring one thing to avoid the other, and using God for this and that. Anyway, if I guess right, I'll be fine. Which one is still talking about arrows and swords? The man who can say "dirty sword" must be an antique!