I think Beck was terrified at the beginning of the interview. I think he was so guarded it was not funny. there was a sparing at the beginning where tucker tried to give beck enough rope to hang himself but beck a lot more savvy then other that tucker has taken on did not double down but carefully went in with draw on statements he has previously made. I think tucker saw this and that Glen Beck was being honest about his views and decided 2 to 3 minutes into the interview not go for the juggler on issues when Beck toned down the rhetoric and said we have to give Trump a chance.
What you saw was a fair amount of honesty in the face of the fact that all men are liars.