The Doctor's all, "Mickey the idiot," but Rose points out that Margaret's not like a marathon runner or anything, just a farting alien Mayor. But just at that moment, the smiley Margaret clips her various jewelry together, and teleports away in a flash of blue light. Jack calls no fair, but Rose reassures him: "Oh, the Doctor's very good with teleports." The Doctor gives a gorgeous grin and sonics Margaret back out of thin air, running toward them with a self-satisfied smile, so she turns around the other way, and he sonics her back around again, and this keeps going on. At some point I guess even Mickey was like, "This 'humor' is really 'subtle,'" and so Margaret finally stops right in front of them, gasping for breath. She gives up, throws her hands in the air: "This is persecution. Why can't you leave me alone? What did I ever do to you?" And a muted trumpet could go "waah, waah, waaaaah," as the Doctor responds: "You tried to kill me and destroy this entire planet," succinctly, and Margaret dismisses him: "...Apart from that."
Back in the exhibition room from the press conference, the Doctor's interrogating Margaret. I like how breezy she is about all of it, it's very Buffy-funny -- and I really admire the Doctor's light touch throughout. He's like, I blew you up and killed your family and you can't leave Earth, so you think to yourself: "Nuclear power station. Of course." She says that it's a "philanthropic gesture," but he's not buying, and points out the coincidence of it being on top of the Rift. Margaret, of course, pretends not to know anything about the Rift. Jack does some very funny sound effects saying that if the power plant went into meltdown, the whole planet would "go shwwwaboom," and the Doctor, on checking out the architectural model, immediately realizes that it's BAD. Rose is like, "Didn't anybody notice? Maybe somebody in London?" Which is about the most dismissive of Wales this episode gets. Margaret starts yelling that nobody cares, because Wales could fall into the sea and whatever, and then stops herself: "Oh...I sound like a Welshman. God help me, I've gone native."
Mickey asks why "she" would do that, considering that "she" would end up dead, too. Margaret complains that "she" has a name, but Mickey's not buying: "She's not even a 'she,' she's a...thing." He combines the nameless female stuff from "Dalek" with the overall xenophobia from "The End Of The World," but at least Mickey has a reason, since the last Slitheen he saw tried to kill both him and Jackie. The Doctor suddenly rips part of the model out and flips it over, revealing a ridiculous circuit board: "Fantastic." Jack gets really excited and calls it a "tribophysical waveform macro-kinetic extrapolator," and he and the Doctor geek out like geeky boys together. (Sarah Jane Smith mentioned "tribophysics" in the Tom Baker-era "Pyramids Of Mars," and there's a tribophysics that deals with friction, but I'm betting on a shoutout.) As Jack bothers Margaret that she's incapable of building the tribowhatsit -- and she finally almost-admits that it's stolen -- the Doctor stares across the room at the banner. Is he actually going to notice the Bad Wolf thing? Yes. Meanwhile, Jack explains Excellently to Mickey that it's a forcefield generator that would carry her out of the blast zone and the solar system. A Silver Surfer kind of surfboard, basically. We'll pause while you imagine MI-5 Margaret surfing through space. That's fun, right? Mickey's kind of mindblown: "You'd blow up a whole planet just to get a lift?" And Margaret gets her edge back, a little: "Like stepping on an anthill."