Crowley is impressed by Aziraphale's angelic voice. When he is commanding, Crowley feels the hairs on the back of his neck stand on end, like he's too close to electricity. And normally, he would comply. Because Aziraphale is, frankly, just a bit terrifying when he's stern like this.

But this is Aziraphale's life. If there's anything that Crowley would fight for, it's Aziraphale's safety.

"I can live with their blood on my hands," he says. "I can't live with yours."