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).