It's a moment before Jacob recognizes him. He's used to jumbo-sized Luther. When he does realize who it is, he opens his mouth for a moment as his face starts to light up with memory. But then he sees the total detachment in Luther's eyes, and his mouth closes with a defeated sigh. That's the look one stranger gives another.

Jacob hangs his head for a moment, then tries to speak again. "You've got no idea who I am, do you."