"You don't get back... I've been here two months now," Topher answers somberly. "I came through the same way you did, but in San Francisco. Been studying the rift ever since, and we've yet to find a way to reverse it. Even if we did, there's no guarantee you wouldn't just end up somewhere else."

Yeah, Topher is holding off on the Sarah Jane question for now. That's probably gonna take more convincing. Instead he leans over and taps at the window, and the car starts driving, now that Luke is done changing. Meanwhile, Topher needs to take off a few layers, given how warm it is in this van.