What is the second half of the sentence "Speak of the devil"? What does it have to do with Lu Bu? Why is it rarely mentioned?

The next sentence is "Isn't it funny to miss it head-on", which is used to ridicule Lu Bu. People seldom mention it because people at that time were afraid to mention it in front of the parties, namely Lu Bu and Cao Cao, for fear of being targeted by them.

At that time, when Cao Cao and Lu Bu were fighting, Cao Cao was trapped by Lu Bu's people because of his carelessness. Knowing that he could not beat Lu Bu at this time, he was ready to run. But what a brave man Lu Bu is, how can he let an important figure like Cao Cao go after him at once?

He saw Cao Cao on the way to catch up. Thinking that Cao Cao was a soldier, he asked Cao Cao if he had seen him. Where did Cao Cao go? Cao Cao Gang saw that he was out of his mind, but after listening to his question, he decided to use his hand very indifferently, pointing to a direction casually, and Lu Bu rushed over. This allowed Cao Cao to escape, and after a robbery, Lu Bu could not catch up with Cao Cao after knowing it.

This story sounds interesting. Cao Cao was clearly in front of Lu Bu, but Lu Bu didn't find it was Cao Cao. So people at that time joked, "Speak of the devil, and he will arrive. It's funny to miss it head-on." But we know that the description of Cao Cao in the book is magnificent, but it is considered by Lu Bu to be a soldier. If such an oolong incident gets out, not only Lu Bu but also Cao Cao will think that these people are laughing at themselves. But Cao Cao is suspicious by nature. When you see these people laughing at yourself, you will naturally feel that these people have opinions about themselves.

So people dare not say this sentence, for fear of revenge by Lu Bu and Cao Cao. In the end, Cao Cao pacified the north and left a face of revenge for himself.