Oh, tish-tosh, what utter nonsense. I'm not going to leave you indecent or in anything improper. I've seen you in nothing but robes for centuries. I think you can stand to just be in your under things and some slacks. Tending your wounds is more important.

[And he thought, He was the stuffy old-fashioned one. He hummed and moved to his feet fetching another bowl of water. It was a cool bowl and Aziraphale placed it on a little table by the chair.

He used the warm water and a flannel to clear the burns first making sure there was no dirt of debris in them.]

What on Eath did they use? Hellfire can't burn you like this can it? I'm almost absolutely certain it can't. And holy water.. they wouldn't be stupid enough to use something that could hurt them as well.