"It is," he says. "It's the worst thing that could happen to you and you wouldn't deserve it."

Crowley can't think of a nightmare worse. Perhaps the Earth being destroyed. Being separated from Aziraphale forever. But Aziraphale losing his goodness? Losing his angelic nature? It was the most horrible thing he could imagine.

"You being an angel, it's----it's what makes you you. The fact that you're too bloody good for your own good. It's what I---" He takes a breath. "It's part of who you are."

He opens his eyes and looks up at Aziraphale. The fire is gone. Aziraphale is there, and he looks like himself.