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.)
But there was never an abruptly forced crisis on this show that can't be easily solved after a few minutes of heart-pounding entertainment, so Amy finally goes for awesome and pauses the video, counting out until the very split-second blip during which the loop starts over. That's fairly clever, I like it. It's almost more annoying when the moments are so brilliant, because it's so dodgy on either side. The Doctor and River enter the chamber, where Amy is very proud of herself for figuring it out; River Song combats every natural condescending bone in her body as she tries to praise Amy for her brilliance without it coming off patronizing.
The Doctor runs over to fiddle with the something or another and he's like, "River, hug Amy. I'm busy." No reason, just him being a dick. What has happened is that the Angel is sending out little visual projections of itself to check out how things are working; using communications as its fingerholds. Which is a great idea, but is just more unrelated new facts heaped on a killer concept, diluting it into story. "It's no longer dormant. It's gone positive!" he yells, which I don't even know what that's supposed to mean, and then River and the Doctor run off to see what the Bishop's accomplished outside.
Amy feels an itching in her eyeball and immediately reports to the Doctor: "Doctor, remember when you said not to look in the eyes? I had actually just done that when you said it, and now I'm feeling a strange itching in my eye. I'm not saying it's related, but since I did the exact thing you told me not to do -- while interacting with a creature whose sole property before this episode had to do with quantum observation -- I'm risking foolishness by making sure you're aware. I wouldn't want it to develop into yet another huge fucking problem that ends up taking five seconds to solve."