In John Updike's "Rabbit, Run," the protagonist experiences a surge of anger stemming from an encounter at a diner filled with mermaids. This moment signifies a turning point for him, as he grapples with deeper emotions and the consequences of his choices. The setting of the diner represents a world of temptation and allure, which complicates his feelings and leads him to confront his frustrations.

The heat on his cheeks symbolizes not just his anger but also a sense of realization about his life. This reaction hints at his internal struggles and suggests that his journey is marked by conflict and desire. The encounter at the diner becomes a catalyst for reflection, pushing him to examine the implications of his actions and the direction he wants his life to take.