Rose chases after the Doctor, because it's not safe in the yard behind the restaurant, but on exiting she finds herself standing on London Bridge. The Doctor dejectedly reveals that he's lost the signal again, and Rose requests clarification on how they're now overlooking the Thames: "Does it fly?" He barely nods in her direction: "Disappears there, reappears here, you wouldn't understand." Sounds rather simple, really. She asks him what about the blindly smashing Auton, still on the loose, and he tells her to drop it because the body melted along with the head. He's snippy due to having lost the signal. She sighs, sad, because she will have to tell Mickey's mother about his rubberizing, beheading, and eventual liquidation. Rough. The Doctor looks at her questioningly, and Rose reminds him of Mickey for, like, the fifth time: "I'll have to tell his mother he's dead, and you just went and forgot him. Again!" He rolls his eyes at her, and she gets creeped out. "You were right, you are alien," she murmurs, and turns away. "Look, if I did forget some kid called Mickey..." begins the Doctor, almost-apologetically, but she's not having it, and she gets very rough on him: "Yeah, he's not a kid." Doctor doesn't have time for her mess: "...It's because I'm trying to save the life of every stupid ape blundering on top of this planet, all right?" "All right!" she yells back. "Yes, it is!" he yells, and they chill out. ("All right" in the UK is like "Aloha" in Hawai'i, or "Smurf" in the Smurf Village. Or "awesome" in a Jacob recap. It means it all. Seventeen words for, in this case, "attitude.") Rose shakes her head disbelievingly and asks why, if he's a total alien, he sounds like he's from the North. "Lots of planets have a North," he scoffs. He folds his arms indignantly and looks away. She asks -- this is funny -- what a "police public call box" is, on behalf of everybody watching, and he's all smiles again. "It's a telephone box from the 1950s." He pats the TARDIS fondly, grinning: "It's a disguise." It's like three jokes, one inside the next. Rose smiles and shakes her head at him indulgently, due to the non-disguise it always was, and the even-less-of-a-disguise that it is in 2005.