Regardless of whether Mary reveals she used to go by a different name, it does at least suggest she was one of the snipers at the pool. Unfortunately, fans will have to wait a long time for confirmation one way or another. The show’s upcoming Christmas special is a one-off that takes place in Victorian England, and the BBC hasn’t even begun production on the next season yet. That leaves plenty of time for showrunner Steven Moffat to mock fans for thinking he’d put clues in an adult coloring book, only to years later mock fans for not picking up on the clues he put in an adult coloring book.