Why do you think the author has Darry confront an old high school buddy at the rumble?

The author likely has Darry confront an old high school buddy at the rumble to highlight the theme of loyalty and the impact of social divisions. This confrontation serves as a reminder of Darry's past and the choices that define relationships, emphasizing the tension between his current responsibilities and nostalgic connections. It also illustrates the emotional stakes of the rumble, showing how personal histories intertwine with the characters' present conflicts. Ultimately, this moment underscores the struggles of identity and belonging within the social landscape of their lives.