I know there are a few lurking comic book reader's on the forum. This is in reference to the Bruce Wayne: Murderer and Bruce Wayne: Fugitive storyline currently running in the various Bat-books. I do have a guess, reading this storyline over the past few months. I think Azrael . This person has full working knowledge of the Batcave, and of the Bruce Wayne/Batman connection. Also It's generally been true that he wants to BE Batman, and wouldn't mind having Bruce out of the way to do it. Remember, the attack was against Bruce, not Batman.