The short story sentry is based on rivals from different planets who are fighting for power over the other planets. The protagonist is thought to be a human viewing the rival aliens attacking them, but in the end the story is revealed to be told from the aliens point of view. We believe Sentry is all about the perspective and the way you view the story. A sentry is a soldier stationed to guard access into a place and from the information in the story the protagonist is the sentry guarding a planet and he or she does not want to be doing so.