How does the author use foreshadowing in The Miss Firecracker Contest?

Mac Sam loves a woman who can "take it right slap on the chin." This foreshadows Carnelle's experience in the Miss Firecracker contest, when she is taunted, heckled, and pelted with peanuts. She reacts by fighting back and spitting like a firecracker, giving a double meaning to the title, and an allusion to a new strength that Carnelle has found inside herself