What is the interpretation of a program in the Noh play of the Japanese medieval martial arts dance that shows the marriage of Wang Zhaojun, a courtesan of the Han Dynasty, to a Hun?

In the Noh play, there is a program that shows the marriage of Wang Zhaojun, a courtesan of the Han Dynasty, to a Hun: the monarch, Emperor Han Yuan Di, sees Wang Zhaojun and Shan Yu of the Huns in a mirror, and Shan Yu, who is accompanied by flutes and raps, comes on stage, jumps on the ground with his feet, and makes a sound with his knees, showing Shan Yu's violent character. This skill of using "force" as the basic dynamic creates a sense of awe.