"No, it does make sense. My roommate's world is totally Earth, she lives in New York, there's a Seattle, she works for the FBI and is one of the best hackers in the world. And yet? No zombies. She'd know, she'd totally know, and she's further ahead than I am. So it makes sense - there are Earthlike worlds out there, a ton of them, probably."

Unless she didn't even understand him at all.