Emergency orders are executed quickly according to laws and regulations. They represent a password when casting spells. You know that the so-called practice at that time was more of a psychological comfort, and it didn't have much practical effect. However, in the feudal era of China, people were convinced of this, which was also the influence of Taoist culture on the people of China.
In fact, not only Taoism, but also other religions like to shout slogans when doing some ceremonies. Personally, I think these slogans are actually to strengthen the confidence of themselves or others, because they may not know whether the so-called wizards have any effect, so Haining's slogans are more authentic.
Now that the times have progressed, we all know that there are no ghosts and spells in this world, and everything can be explained by science. So, why do so many people like to invite Taoist priests now? It's because people want to find a spiritual sustenance when they encounter something they can't solve or phenomena they can't understand, because when you find a spiritual sustenance that you think is true, you won't be so afraid of the unknown. After all, he has a way to understand or explain, even if this so-called explanation is wrong.