How does Huang Rong’s soft hedgehog armor manage to be retractable and retractable so that it can stab whoever it wants?

Huang Rong's soft hedgehog armor was given to him by his father, Yaoshi Dongxiehuang. The soft hedgehog armor itself was invulnerable and helped Huang Rong defend against bows, arrows, swords and guns many times, and it also had barbs. If you touch it rashly, the person you touch will be injured.

Soft hedgehog armor is mentioned many times in "The Legend of the Condor Heroes", and Huang Rong also accidentally injured many people with soft hedgehog armor. I think the soft hedgehog armor is the golden finger Mr. Jin Yong gave to Huang Rong, who was not very good at martial arts. After all, Huang Rong is the leading female character. Although she is extremely smart, it would be difficult for her to thrive in the world without powerful equipment. In many plots, her weak martial arts would weaken the strength of others.

The book often writes that Huang Rong and Guo Jing are close to each other. The story gives a vague explanation as to why the soft hedgehog armor did not hurt Guo Jing. The general idea is that Huang Rong would deliberately control her soft hedgehog armor not to hurt anyone when she was close to Guo Jing. I guess the barbs of the soft hedgehog armor have a certain angle. If the angle is right, it can avoid hurting people. Or the soft hedgehog armor can respond to infuriating energy and internal force, and the user can use his or her own internal force to control the retraction and expansion of the thorns.

In that case, soft hedgehog armor is really a very magical treasure.