Word Count: 3274
Notes: Based off of this kinkmeme prompt. Very spoilery. Essentially, prompter wanted to see Watson and Moriarty's right-hand-man beat the bejesus out of eachother. *SPOILERS* for the entire film.
Summary: "He is carrying a long package wrapped in brown paper and twine. He would bet his life that it is a rifle."
Here, on AO3.