Christina outlines the problem -- "we have to drive five tons of bus, which is currently buried in the sand, and we've got nothing but our bare hands" -- and the solution, which is applying themselves to the problem with discipline! I couldn't agree more, which bums me out because on paper she is so awesome, but in the flesh she is so unbearable. I wasn't that put off by her the first time I watched it, but on subsequent viewings it's excruciating. I think I finally understand why people got so weird about Reinette. So anyway, she orders everybody around and is generally the cutest goddamn thing for about a year, and the Doctor's sort of charmed about it, and they get on the bus, and thankfully we skip to the end of her condescending speech, and the tells the Doctor to start talking.
Instead, magical black lady gets all magical on his ass and explains that the wormhole is not a naturally occurring phenomenon, but whatever, and they stop talking about their impending deaths so they can have a whole long drawn-out thing about how magical black lady is magical, not in a huge way but in a like, "We win ten pounds every week in the lottery" way, and the Doctor figures out that, much like Kal-El under a yellow sun, this stupid planet has increased her magical blackness by some factor where now she can see how many fingers he's holding up behind his back. Also, "death" is coming, on the wind, and "shining."
At this news, all the interchangeables get interchangeably charged up and start screaming and yelling at each other, and one of them starts crying, and then the Doctor asks her where she was going, before the wormhole, and they talk about that and torture themselves with thoughts of home, but it's meant to be comforting. What it is, is beyond fucking annoying, and the music is like, "Aww," because these two-dimensional people already have the most obvious personalities so you already know where they're going. The white lady has a niece or some shit. The young white kid lost his job and wants to watch movies or eat snacks or something. "Telly" at his "flat" at the top of the "apples and pears" or whatever. Whatever sucks. The black kid has a girlfriend, or a potential girlfriend, and the ninja is on the run, and the magical black people like to eat lambchops.