"Good thing it was you," Crowley says, moving to the angel's arms. He can't put any weight on the injured leg, but he can put some on the other. "Wouldn't have been any fun if it was anyone else."

And, while Crowley couldn't have fought Hastur on his own, he could certainly have fought him with his friend. Defeated him with Aziraphale by his side. Or, well, up in the air. There, part of the battle. Metaphorically by his side.

"Thank you," he says, finally, as they move their way towards the washroom to clean him up. "For this."

It's a bit embarrassing. Crowley is always the one to save Aziraphale, and now here Aziraphale is, saving him twice in one day.