Crowley considers lying for one whole second. He's pretty good at lying, and they're in such a state right now that he's pretty sure that Aziraphale would believe him if he lied. Aziraphale has caught him on a number of lies over the many centuries, but right now, he's pretty sure he'd get away with it.

But how could he lie to Aziraphale now? All they really have is each other.

"When Hastur hit me," he says, wincing as he touches his thigh. "He didn't just hit me, he---threw something at me. I don't know. A curse, probably. Something demonic. Something that can't just be restored with a miracle. It's never that easy, not with someone like Hastur. He likes his curses old and boring and awful."