Basically as the season goes on more is revealed aboutt he Professors past and how him and his buddy did bad things when they were in school together which is why the Professor killed him.
Sinner knows. He finds out from Prof's old college roommate that the Professor was photographed after a night out of getting down in the mud with Buddy Boy.
Meanwhile the Professor is falling apart mentally. Almost to the point of killing his own newborn baby.
So The Professor goes to Sinner and asks for help. They go to a mental health dude. But just like your typical DumbA mental health dude, he acts like a superior Ahole and The Professor bolts on The Sinner.
Thanks where this one ends. 5/10.