C32 The southern spirit king and the northern spirit king

Furthermore, on the way back, everyone actually bumped into some familiar spirits. Among them, Tian Luo was the one who knew the most. When the spirit creatures saw Yu Tian Luo, they all waved at him but did not say anything.

Could it be that being unable to speak required one to abide by the rules between the spirit and spirit? From the looks of it, he didn't seem to be kind to them