What do you mean by not using a crocodile knife to kill me?

Don’t kill me with a crocodile knife. You can hurt me, but don’t hurt me with the things I hold dear. The original meaning of this meme is don't use the emotional knife to kill me, which means don't hurt me emotionally. The full version is about the tortures of the Manchu and Qing Dynasties. Don't use the emotional knife to kill. The sword is only three points of pain, so don't use the emotional knife.