A closed post, because only Crowley is qualified for this

Historically, there are basically, sort of, two or three basic ways to categorize angels. Think of an angel and what do you picture? Right: either you're thinking of an adorable cherub with cute little wings and a harp, or you're thinking of Gabriel descending benignly from on high to tell poor Mary that abstinence is not effective contraception¹, or you're thinking of some kind of terrifying many-eyed wheel of flames and animal heads.

You're probably not thinking of an irritable Englishman in a waistcoat, trying and failing to sort the library of a vast and changeable mansion. These shelves are not responding to his attempts to impose order and it's starting to grate on Aziraphale. He's even got his shirtsleeves rolled up and his jacket off about it.

He mutters to himself as he bustles back and forth across the library, shuttling various stacks of books around. There will almost certainly be no lasting effect.

¹The theological implications are dizzying if one applies this more broadly, so let's just be grateful that it was a one-off.