This story turned out to be the idiom "Bei Gong She Ying".
2
这个故事就是后来我的们成语“杯弓蛇影”,它常用来描述一个人的疑心重,总是在自己的阴影中害怕。
This story was later contracted into the idiom "Bei Gong She ying '. It is used to describe someone who is very suspicious. It is like saying someone is afraid of his own shadow."
3
这则故事后来演化为成语“杯弓蛇影”,用以形容那些非常多疑的人。
This story was later contracted into the idiom, "mistaking the reflection of a bow in the cup for a snake." We use it to describe someone who is very suspicious.