In The Untamed, why did Jiang Cheng, played by Wang Zhuocheng, stab Wei Wuxian when he jumped off a cliff?

When Wei Wuxian jumped off a cliff, Jiang Cheng stabbed Wei Wuxian to death with his sword, which is what many people don't understand. I believe many people are puzzled by Jiang Cheng's behavior after seeing it. Since he wants to kill Wei Wuxian, why not kill him with a sword? Said he didn't want to kill him, and forced him to let Wei Wuxian go, so it's doubtful!

In fact, I didn't understand it at first, but after thinking about it, I found that the reason seems very simple! Although Wei Wuxian stabbed Jiang Cheng when he died, Jiang Cheng was very painful. The first thing that comes to mind is that Wei Wuxian did all this, so at that moment he hated Wei Wuxian and wanted him to die! At this time, Jiang Cheng, who lost his sister, hated Wei Wuxian, so he went to the edge of the cliff and stabbed Wei Wuxian with his sword, but in fact he stabbed the stone wall. After that, Wei Wuxian rudely shook off Lan Zhan's hand and fell himself!

But he also knows that his sister cares about Wei Wuxian very much, and there is a deep brotherhood between them. So after ideological struggle, Jiang Cheng finally stabbed the sword on the cliff, probably to force Lan Zhan to let go and then let Wei Wuxian die. For Jiang Cheng, Wei Wuxian is one of the few closest people in the world except his parents and sister. He is both a friend and a brother. Besides, he is also eager to run Taohuawu with Wei Wuxian. This sword is not as simple as life and death, but a helpless choice, a spirit of bidding farewell to the past! As the head of the family, Jiang Cheng Jiang Cheng had to swing swords at each other, on the one hand, to explain to the families, on the other hand, he didn't know how to start. Jiangcheng secretly protected Wei Wuxian in his own way. Although the process is very tangled, it is still difficult to make your own choices in the end. How much compromise, how much vulnerability, knowledge must be achieved.

Although Jiang Cheng hated Wei Wuxian for killing his sister, he still cherished Wei Wuxian. Otherwise, he wouldn't be so happy to see Wei Wuxian again in sixteen years. They grew up together and had a wonderful past under the protection of their sister. How can the feelings between them break up? It's just that the death of my sister gave Jiang a great blow, so that he couldn't forget that her death was to save Wei Wuxian.