In "The Son of Neptune" by Rick Riordan, a character named Terminus evaluates Percy and determines that he is clean. This brief interaction highlights a moment of tension and examination, typical of the story's adventurous atmosphere. Percy, however, reacts with sarcasm, expressing his frustration by declaring the situation to be stupid. The exchange reflects Percy's character, showcasing his witty and rebellious nature in the face of authority. This moment adds depth to the narrative, illustrating the challenges he faces as he navigates a world filled with mythical creatures and complex relationships. Through these interactions, Riordan effectively builds the tension while maintaining humor and character depth throughout the story.