"I don't suppose time travelers never show up," he says. "There have been several incidents of people accidentally going to the past that I can recount off the top of my head. Though... those occasions tend to be secret. One virtue of being from the future, supposedly, is that you can manage to avoid detection in the present."

He shrugs. That ship has sailed, for him. He's detected.

"Once you are discovered," he says, "then the law of the time probably will do its best to figure out what you know, and how that can be used."