Hunhun's words insulted FZZ and his wife, which made him a personal enemy of FZZ.
Sometimes things just have to be done in this way. Like what happened in the movie <scent of a women>, when charles was offered the bribe, he just cannot give out the names anymore, although it may be the right thing to do.
this situation is sad, but it made them two great persons.
of course, there could be better ways to solve this problem.