Your guard bit her tongue, then continued. "Because when we replace a pony, we try to take every aspect of their lives, so nopony can see through the illusion. Turns out my victim was a fan of novels of all sorts. Romance, adventure, mystery, horror, just about everything. Initially I was frustrated with wasting time that should have been directed toward ensuring Queen Chrysalis' total victory, but in time I found some books that interested me. When the plan fell apart and we returned to the hive, I started to visit the library for personal enjoyment."