Lynda watches the Daleks flying up the ventilation shafts on her board, then realizes that they're heading downward. She doesn't figure it out immediately, but that feeling in your stomach sure does. The Daleks flood out of the doors on Floor Zero, and start exterminating the veal left and right. It's a horrible scene, lots of zapping and people dying and not knowing why, and all the time with the "Exterminate!" A Dalek closes in on Rodrick, and he challenges his right to exist: "It's not fair! I won the game! I should be rich! I'm a winner, you can't do this to me!" Just sympathy, now. He's an asshole in exactly the same way Cathica was: she might as well have created him. Maybe she did.
Lynda listens to the screaming of Floor Zero, horrified, and eventually turns it off. (And how cool is it that out of "nowhere" she can't even handle hearing the contestants dying anymore? Well done, Doctor.) She fights back her tears and opens the intercom to Jack: "Floor Zero. They killed them all." She begins to sob. Given that her character has now gone through an entire arc in like ten scenes, she might as well drop dead now. Which I'm sure she will, but still: nice.
Rose slumps on to one of the comfy TARDIS chairs, just completely out of it. No more hoping for her keys. Jackie watches and tries to console her: "It was never gonna work, sweetheart. And the Doctor knew that. He just wanted you to be safe." Rose protests, but Jackie advises her to lock the door: "Walk away." I wonder whether she knew about that part of Episode 1? Nice connection with the Doctor, if not. "Dad wouldn't give up," says Rose, and Jackie stares at her: "Well, he's not here, is he?" Beat. "And even if he was, he'd say the same." Rose doesn't even think: "No, he wouldn't. He'd tell me to try anything. If I could save the Doctor's life.... Try anything." Jackie's like, "We could both make up stories about your father all day, considering we've been doing it since the day he died and it's proven a pretty good coping mechanism," but Rose has the upper hand now: "I know, because I met him. I met Dad." Jackie gets very still and not entirely unscary: "Don't be ridiculous." And I think by "ridiculous" Jackie means "speaking." Rose sits up straight and spills the beans: "The Doctor took me back in time, and I met Dad." Jackie tells her not to say that, and Rose begins to remind her of the day Pete Tyler died: "There was someone with him," Rose says, voice cracking all across. "A girl. A blonde girl. She held his hand...." Jackie stares; she doesn't blink. Rose begins to get frustrated: "You saw her from a distance, mum! You saw her! Think about it! That was me. You saw me." And Jackie tells her harshly to cram it. Rose continues: "...That's how good the Doctor is --" Jackie shouts at her to stop, and goes running from the TARDIS. Rose begins to shake now, sobbing, overcome with grief. I gotta tell you I was mystified by this scene. Why? Why go there? Why bring it up at all? But I think I worked it out.