Any smart person can see that Hundred Yin Venerable is not punishing severely, but clearly protecting his own.
If they had to wait until Nine Heavens Palace Master handled the matter, it would not be as simple as it is now. With Guangsheng's crime, it would be easy to sentence him to a serious crime, making it difficult for him to turn things around.
Otherwise, who would appease and suppress the anger of these Nirvana Stage experts?
Yang Chen could see it, and so could the Nine Heavens Palace Master.
Although Hundred Yin Venerable seemed harsh on his disciple in usual times, now he made a move to save his disciple. Once he made a move and ordered Guangsheng to be suppressed, the subsequent handling of Guangsheng would be entirely up to Hundred Yin himself.
However, Guangsheng could not see through the thoughts of Hundred Yin Venerable.