After watching "Chen Qing Ling" three times, I still don't understand

watched "Chen Qingling" three times, but I still don't understand it. At the end of the battle, Wei Wuxian jumped off the cliff and Jiang Cheng stabbed a sword into the stone. What does it mean?

At that time, Wei Wuxian's Wen family, whom Wei Wuxian had paid a heavy price to protect, were all dead. They were in pain, and they were helpless when they were fighting alone. The elder sister who was best to him, died for him. Jiang Cheng blamed him. The death of Senior Sister was the last straw to overwhelm him. The self-blame, remorse, and pain made him desperate to live and love.

saved those people from the Wen family and charged the so-called "apostasy". Is it really worth it? Only Wei Ying can do it. Leaving the senior sister and Jiang Cheng, leaving the familiar lotus dock, and leaving Lan Zhan, a group of people live in a mass grave with nightmares on nothing, just to help the strong and help the weak and justice. But the price is too great, it's really worthless.

Wei Wuxian jumped off the cliff in despair, and when Lan Zhan caught Wei Wuxian, Wei Wuxian smiled. He must be very happy when Lan Zhan caught him when everyone thought he was dead. Lan Zhan has always been afraid that his mind will be affected. He wants to prove: You see, I haven't changed. If I really change, I will end it myself. When Jiang Cheng came, he also laughed, and the juniors who had been playing since childhood also came to rescue him. But Jiang Cheng raised his sword and stabbed him.

enviously froze for a while, then smiled again. I broke free of Lan Zhan's hand and fell. He must be thinking that his death can be counted as Jiang Cheng's killing, it can be regarded as Jiang Chengli's merit, it can bring more to Yunmeng in the future, and it can be regarded as returning back what is owed to the Jiang family.

The key is that Jiang Cheng’s sword was stabbed on a stone, so does Jiang Cheng want him to die, or does he not want him to die? This scene is too vague. It was Jiang Cheng who stabbed Wei Wuxian but was avoided by Lan Zhan? Or did Jiang Cheng subconsciously avoid Wei Wuxian and stabbed the stone? Or was Jiang Cheng deliberately stabbing the stone to get them both down?

As long as Jiang Cheng doesn't make up for this sword, perhaps Wei Wuxian will really be pulled up. He can hardly believe it when he sees Lan Zhan holding him, and there is a slight brilliance in his eyes. It's a pity that Wei Wuxian's feelings for Lan Zhan were not very thorough. At least in his heart, Lan Zhan and Jiang Cheng had the same weight. Only in his guilt and regret would he choose death to get rid of it.

How do you understand the sword Jiang Cheng stabbed?