"For all I know, Grandpa Barry is still just a lab guy for the police in your world. Lightning doesn't always strike the same place," Bart said, shrugging a little. "The multiverse is a pretty complicated place, and I know thinking about potential realities is nothing but a recipe for a migraine."

He considers, and then looks around. "I'm terrible at explaining things, anyway. And I know there are things you wouldn't want me to just talk about, mostly involving the Gotham crowd. Not that I know a lot, since He doesn't like me visiting."