It makes sense if you think about it this way: if that He killed the MC, it would be an EX or MX killing a junior EH, it would be good for his clan but not necessarily for him; everything works with justification, imagine, he kills the heir of the Wu, a junior, Wu Chao would be right to kill him, the He would have no reason to protect a mere EX or MX from a small town and antagonize one of the most powerful PX, that is, that guy would die for a foolish decision. If nothing else, the He guys aren't impulsive idiots (excluding He Gang, I guess).I could understand the Xiantian part if it weren't for the He Clan. As I mentioned before, the MC is their direct enemy, so killing him would only give them an advantage. If it were from another clan, your explanation would be correct, but in this situation, there’s no reason not to kill him since they are mortal enemies regardless.
the MC hit that Xiantian in the face, so I don't see any reason why they wouldn't kill him. Of course, the scene may have changed since I last played, but the last time I saw it, you just failed the mission. You didn’t even need to pass a stat check to survive or anything like that.