Aziraphale, who has lived through the entire span of human history and remembers when the time when the person who had steady enough hands to be a surgeon was the same person entrusted to be a barber, or a time when lead went into face creams, or a time when drinking mercury was seen as the epitome of health. He also knew of all the terrible things people could do to each other for fun, the sorts of horrors they inflicted upon their fellow man.

So, watching Bucky get dissected on a table, which for all intents and purposes seemed clean, and which was attended by actual doctors, totally against his will, isn't the most shocking thing he's seen by a long shot.

And yet, the face he wears is sympathetic. Because of all these horrible things, Aziraphale has liked precisely zero of them. Even if they led to greater medical advances, even if humanity has done well for itself considering how many of them were treated as disposable.

"But your hair has returned," he says. "So let's focus on getting rid of your other scars, yes?"