"Maybe there's more of our city in this world," Oliver guessed. Then his eyes widened. "Maybe... maybe this isn't a different world. Maybe this is the future...?"
"Well, obviously we'd have to find them first," Oliver said. "And even then, there has to be someone with enough power who doesn't agree with what they're doing."
"Yeah, that's true," Oliver said, nodding. "And with something feral, they won't trick you into thinking they're friendly then attack you from behind."