Let’s talk about the moment Aziraphale *almost* denies the Metatron.
“Anything you need to take with you?”
“No. Nothing I can think of.”
His voice is uncertain. He gazes longingly through the window, where Crowley waits by the Bentley. Aziraphale hasn’t lost him yet. It isn’t too late to change his mind. We can see it play out across his face, and he wheels on the Metatron.
“I—I think I…”
What? Changed my mind? Made a mistake? Can’t do this? Can’t do it without Crowley? The micro expressions going on in this second look out the window are absolutely crushing. The hint of a smile is gone. His face is cast in shadow. He is resigned.
He’s decided. The possibility he could fix things in Heaven is too strong a draw to back out now. Crowley is still waiting out there. He’ll always be waiting. Maybe Aziraphale can make a better world for him.
“Nothing at all.”
This smile is *forced.* Aziraphale truly believes he can change the system. He needs Crowley. But the only thing he wants more than being with Crowley *right now* is the chance to be with him indefinitely in a world where they are free to love one another without fear.
The entire scene is shot in such a way that when Aziraphale is alone on screen, he occupies only half of the frame. He is only one part of a whole, and the loss of Crowley (for the time being) is palpable. Out in the street, the shot of Crowley is framed in a similar way, though reversed.
I still feel ways(TM) about Aziraphale’s decisions at the end of E6, but this little moment of “I—I think I…” is proof he considered backing out, and almost, *almost* went through with it. He could have rushed to Crowley, could have run away with him to the South Downs or to Alpha Centauri, but the system would stay broken, and any peace they would’ve had would only be borrowed. He wants to give Crowley the real thing—all of his love, all of the future, unfettered by the constant threat of a corrupt Heaven.