"I found this. Definitive work on the Angels. Well, the only one. Written by a madman, it's barely readable, but I've marked a few passages..." The Doctor recognizes it, I guess -- "Didn't you hate his girlfriend?" -- and smells it like he does lately, as Amy asks Song about whether there was another clip. She heads back inside to see the Angel standing, arms tossed out and getting closer in every loop, while the Doctor complains that there's something wrong with the book.
"Oh, it's so strange when you go all baby-face. How early is this for you?" Very. He doesn't know what she's about yet. "How do you know who I am? I don't always look the same." She's got pictures, all his faces. "You never show up in the right order though. I need the Spotter's Guide..." He's distracted by what she said, so sweetly: There aren't any pictures in the madman's book. While Amy yells at the Angel, that it shouldn't be moving and the usual, and tries to turn it off -- and once again we see her, framed and staring out at us -- and the Angel gets closer, fascinating her on the screen, and finds that she is locked inside, and the Angel bares its teeth, outside the barracks the Doctor and the Doctor remember something you'd think would be just a bit more memorable. Everybody gets stupid.
"What does that mean, 'An image of an Angel becomes itself an Angel?'" After a few seconds, they figure out what should have been immediately obvious but took them just the few seconds necessary to make something exciting happen to Amy, they try to crack back into the barracks. Amy winks first one eye and then the other, desperately trying not to blink per the folklore, as they scream at each other through the walls. It comes out of the screen at her, at us, and for some reason it has locked River and the Doctor out, and Amy gets very nervous about what it's going to do to her, and she locks eyes with the Angel... Just in time for the Doctor to tell us a whole new rule about the Angels that we never knew before, and contradicts actual shit that has happened on this show: "Amy, not the eyes. Look anywhere but don't look at the eyes! 'The eyes are not the windows of the soul, they are the doors. Beware what may enter there.'"
I mean, if these are the rules then there is literally no point to any of this. Keep reading that madman's book and you might end up yelling, "Hum quietly the theme to A Summer Place and it will bake you some biscuits! Do it, Amy!" And she could be like "I don't know that song!" And he could hum forcefully at the door. "Amy, turn yourself around like the hokey-pokey, but don't look into its eyes, but don't look away, as you step toward it backwards with an air of regret! You will meld with the Angel and it will become a robot body that will give you unimaginable power!" Or "Close your eyes, but don't close your eyes, and dance a foxtrot with the memory of blindness, while giving the illusion of confidence! Or you will surely die!" (You think I'm exaggerating, but that's almost exactly what is going to happen next week.)