Zachary lashes out at Katie because her rejection embarrasses him. He’s too concerned about suffering the public humiliation of rejection to think about the way his poor behavior impacts Katie. This scene is important, too, since it reveals a potential David Ware sighting. It’s possible that another murder will soon take place. Finally, this passage further develops Caleb as a sympathetic character. Everyone judges him for being overly concerned with outward appearances, and Caleb worries about these things, too. Like all the other teens at Osborne High, Caleb suffers from self-doubt and guilt that he’s not trying hard enough to be a good person.