I have gotten used to the fact that humanoid enemies can drop certain things like crafting resources and recipes. Sure, goblins carry gems that they mine, that makes sense. But why is this troll carrying around a recipe for Superb Dwarf-Make Radiant Shoes? Does he long to retire from the military life and take up cobbling? Was he drawn to the fine penmanship in the instructions? Foot fetishist? Do shoes scale well from dwarf-sized to troll-sized? Does he have a troll-friend who makes pretty elvish dresses?
Who knows what lurks in the hearts of mobs?