In a Flat Arc, the protagonist won’t actually doubt the Truth, but he will be brought to a point where he seriously doubts his ability to use the Truth to defeat the Lie. This is the scene where he throws stuff against the wall and rages against his own impotence. What’s the point of the fight—what’s the point of everything he’s already suffered—if all he’s been able to do so far is put a dent in the antagonistic force’s armor?
