What is one foreshadowing part in Stargirl chapters 1-9?

In chapters 1-9 of the novel "Stargirl" by Jerry Spinelli, one subtle moment of foreshadowing occurs in chapter 9, when Leo Borlock is confronted by his English teacher, Mr. McFee. During this conversation, Mr. McFee mentions a boy who was bullied in their school years ago. He goes on to say that the boy eventually left town and was never heard from again. This brief glimpse into the past serves as a hint of the possible consequences of the growing animosity towards Stargirl within the student body, setting the stage for the challenges Leo will face in trying to protect her from their cruel behavior.