[He peeks down at the diagrams, and at first, he doesn't really know what he's supposed to be looking at. Hands? What about them?]

Looks like something you'd see in a hospital or a medical book. [And this time he doesn't even fight his impulse — he looks down at his own hands, raising one and turning it over.] Wonder what they were studying them for. Maybe the same thing they were doing with mouths and—

[That's it.]

—The people in the pictures. [He's almost startled with what he remembers.] Their hands were scratched out too. Remember?