Idiom stories of blind people touching elephants and blind horses

In the Eastern Jin Dynasty, Huan Xuan, Yin Zhong Kan and Gu Kaizhi got together to chat and see who said something thrilling. Huan Xuan first said: "The spearhead is like a sword." It means: Taomi with spear tip and cooking with sword. Yin Zhongkan went on to say, "A centenarian climbs dead branches." It means that an old man is hanging on a dry branch, which is naturally dangerous. At this time, someone went on to say, "The pulley on the well is lying on the baby." It seems more dangerous to say that a baby is asleep on the pulley on the well platform. Gu Kaizhi said: "The blind man rides a blind horse and comes to the deep pool in the middle of the night." Yin Zhongkan, who was blind in one eye, was shocked and blurted out: "This is terrible!" Think about it, is it dangerous for a blind man to ride a blind horse and walk into a deep pool in the middle of the night?

Later generations simplified "riding a blind horse" to "riding a blind horse", also known as "riding by the pool", which is very dangerous.