What is the reason why Xu Fengnian agrees with Cao Changqing to take away the ginger paste in "Send charcoal in the snow"?

In A Sword in the Snow, Xu Fengnian agrees that Cao Changqing will take the ginger paste away, hoping to change the unfavorable environment in which the ginger paste is located. Then there is the pressure and helplessness of father Jiao Xu. And most importantly, Xu Fengnian can't beat Cao Changqing in martial arts. Knowing that Cao Changqing wouldn't be in direct danger to Ginger Paste, he didn't want Ginger Paste to take risks with himself, so he agreed that Cao Changqing would take Ginger Paste away.

Changing Jiang Ni's living environment Jiang Ni was originally a princess of Chu, but she lost her parents because of the war, which can be said to be a bumpy fate. In the past, the river mud, which was not in the scenery, lived in a foreign land and finally became a slave. Handmaiden from noble birth to humble birth, can be said to be worlds apart, and Xu Fengnian has a special liking for ginger paste, and he doesn't treat ginger paste as a handmaiden at all in his heart. When Cao Changqing wanted to take the ginger paste away, Xu Fengnian endured his heartache and reluctance, and also wanted the ginger paste to leave the present handmaiden environment. Xu Fengnian also thinks that in this case, ginger paste can be happier, so he agrees to take ginger paste from Cao Changqing.

Under the pressure of his father, Cao Changqing took the ginger paste away, so as to use the princess status of the ginger paste to have more followers and help him to revive Chu. In the form of Xu Fengnian's father Xu Jiao at that time, Xu Jiao's actions have always been the heart disease of Liyang Dynasty, and Cao Changqing's taking ginger paste to restore the country will distract the attention of Liyang royal family, reduce the pressure of Xu Jiao's northern beam and ease the tension with Liyang royal family. Plus Jiao Xu is also a man of great vision. When Cao Changqing came to Beiliang to ask for ginger paste, he still supported Cao Changqing for various reasons, and Xu Fengnian could not resist his father. After the trip, Xu Fengnian also learned more about the weight and trade-offs. Cao Changqing won't leave if he doesn't make a decision for a long time. The existence of his ginger paste status will make the royal family hunt him down after Yang. Coupled with the long time, it is bound to find an excuse for the royal family to go north from Yang.

Cao Changqing's rival in martial arts, Xu Fengnian, is surrounded by Li Chungang, but Li Chungang is old after all, and his martial arts realm is not what it used to be, and his martial arts appraisal is lower than that of Cao Changqing, who ranks third. It is impossible to have other space to take care of others around you in a duel with your master. If Cao Changqing fought wholeheartedly, it would be difficult to survive with Xu Fengnian's martial arts at that time, and it would be difficult for Li Chungang to keep Xu Fengnian safe if he desperately dealt with Cao Changqing. Xu Fengnian will not let Li Chungang put his life in danger for himself. He knew that it was unwise for Li Chungang and himself, and he could only agree that Cao Changqing should take the ginger sauce.