Peace is to war as life is to death, one can not exist without the other but they both make each other better.
The author relayed the story behind the photo that is hanging above the fireplace.
In its place of honor, the framed photo is most likely a conversation opener. It can be inferred that the author is telling the story of how he got the perfect shot of the buck.
By his narration, the setting was making it possible for him to quietly take a photo and when buck looked straight at him, he had the best and once in a lifetime opportunity to take a wildlife photo in its perfection.
google says it means big brother idioms
*They tell him about the ghost that appeared in the night. Why did Marcellus and Bernardo bring Horatio to the watch that night? *to see if the ghost would appear. *Horatio says it is just their immagination, so he joins them so if the ghost does appear, he will confirm it with his own eyes.