This is the first time we've seen Shu Mingxue, and he's all, "Hey dad, I know you're here. I'm going to kill your son for you." He's got a plan: he'll kill anyone who's close to him, and then feed him to the dogs so that no one is harmed. This is all very well and good, but it's not going to solve the problem of how to get rid of the evil spirit that's been keeping him from cultivating his martial arts.
This is the first time we've seen Shu Mingxue, and he's all, "Hey dad, I know you're here. I'm going to kill your son for you." He's got a plan: he'll kill anyone who's close to him, and then feed him to the dogs so that no one is harmed. This is all very well and good, but it's not going to solve the problem of how to get rid of the evil spirit that's been keeping him from cultivating his martial arts.