In Chapter 11, how do you explain the behaviour of the bullying senior?

The anonymous note is a frightening early sign that Gordon High is beginning to take The Wave seriously. The fact that the note is unsigned is an important plot device, but it also has thematic significance. The fact that the note could not have been written by a main character (all the novel’s primary characters are seniors, and the letter-writer refers to himself as a junior) shows that The Wave’s impact extends far beyond the select group of characters that Strasser describes.