Wow this arc is so complicated, so many betrayals. I understand that the senior sister would "incapacitate" little Mo to get the core for herself, but she went far beyond that by trapping him with a spirit who want to take over his body... (who is this spirit by the way ? Where did he come from ?) so I don't really get her betrayal. As for the cat sword master I am not sure why he would want to make known that he is alive... I am a bit lost here...