The writing style of Ellison's story "Battle Royal" (from the novel Invisible Man) is one of the frame story. The narrator is telling about the advice his grandfather gave to his father (the narrator's father) about life.
The grandfather's advice is to never give up his fight. Based upon this, the themes of the text develop over the action. The themes revolve around friendship, racism, equality, and action.
The advice of the grandfather pushes the narrator to do just that. He grows up knowing that it is important to never give up. During the unending fight, the narrator must learn how to fight while not forgetting who he is and what he stands for.
The writing style allows the reader to get into the mind of the narrator and feel his confusion and pain. The theme of the text reiterates the importance of standing up for what one believes, but, simultaneously, shows the pain it causes for the narrator.