Why do you say that when you are red-faced without any reason, you can prevent disasters?

Many times, some disasters are avoidable by us, especially man-made disasters. You can tell at a glance that some people will bring losses to you, so try to stay away from such people, which is naturally equivalent to staying away from things that will bring disasters to yourself. This is actually a very important thing. Next, let’s take a look at the physiognomy column. What does it mean to have a red face for no reason to prevent disasters?