The Doctor slams the door on the monsters, and inside, he looks at their shadows outside the window glass, answering his own Excellent Questions: "They can't get in. Old windows and doors. Okay. The older something is, the stronger it is. What else?" He sends guests to check the other doors, as the monsters screech outside. Jackie follows him to a side door, bitching and grabbing at him, terrified. The Doctor attempts to explain to her: "There's been an accident in time, a wound in time. They're like bacteria, taking advantage." I wonder if they're aren't also like bacteria, breaking down this fake timeline into rot. "What do you mean time?" Jackie shouts, in her most irritating possible Jackie voice. "What're you jabbering on about, time?" The Doctor whips around on her, cutely exasperated: "Might've known you'd argue. Jackie, I'm sick of you complaining..." -- and of course she's like, "Bwuh?" -- "...I haven't got time for this!" Jackie says that they've never met, and the Doctor says they never will, unless he sorts this out: "Now, if you don't mind -- I've waited a long time to say this -- Jackie Tyler, do as I say. Go and check the doors!" He points, strong and pretty scary, and she stares up at him: "Yes, sir. " A few people have noted that the angle is consistently up a bit, on Jackie and Pete -- so they're taller than we are -- and consistently a bit down, on Rose, throughout the episode. Isn't that nice? Don't you love that? The Doctor's like eleven feet tall right now, that's why I remembered.
Jackie slinks off, and the very pleased-with-himself Doctor grins hugely at Stuart, saying, "I should've done that ages ago." Stuart tells him that Sonny was out there, and the Doctor sadly explains that Stuart can mourn Sonny later, that they have to stay alive, and that there was nothing he could do for Stuart's dad. There are things the Doctor can't do, like save your dad for you. Stuart produces Sonny's phone and shows him the Bell call, which the Doctor Excellently identifies for us. He gives the useless phone back to Stuart, and runs to check another door. Rose watches as the Doctor explains to Stuart about the police: "Can't help you now. No one can. Nothing in this universe can harm those things. Time's been damaged, and they've come to sterilize the wound..." Right. The Doctor stops before Rose and looks her in the eye. "...By consuming everything in sight." She begins to shake. "Is this because..." The Doctor looks down at Rose, sad and scared, but no longer angry. Just tired. "Is this my fault?" she asks. He doesn't answer, just walks past her to continue working. Pete looks at the Doctor, at Rose. At the baby in his arms. Pete's very clever.