What incident occurs on the last day of school?

Camelia Hammond is preparing for summer on the last day of school. Having just turned sixteen, Camelia is almost hit by Gloria Beckham's car as it peels across the parking lot toward her. At the last minute, Camelia is shoved aside by an unknown savior, a boy who asks her if she is alright and needs medical attention. Camelia, who is bruised, says she does not. A friend calls for an ambulance and soon the mystery boy takes off on his motorcycle.