The phrase "Cover your butt. Bernard is watching" reflects a critical theme in Orson Scott Card's novel, Ender's Game. It suggests the need for caution and self-preservation in a competitive environment where peers may exploit one another's weaknesses. Bernard, one of the characters, embodies the bullying culture present in the story, reminding others to be vigilant about their actions and to protect themselves from potential attacks. This creates a sense of paranoia among the characters as they navigate their relationships.

This quote encapsulates the pressures faced by young characters in the Battle School. The atmosphere is rife with rivalry, making it essential for them to be strategic about their interactions. The warning serves as a reminder that in high-stakes situations, such as those depicted in the book, individuals must often prioritize their own safety above trust, leading to an erosion of camaraderie and friendship. Overall, it highlights the harsh realities of their environment, where one must constantly be aware of their peers' intentions.