This was not a normal truth; this was a selfish one. He wanted to hear Arthur's voice, hear him talk about something in the way he knows how. He wanted reassurance that Arthur was still there, that he's still real.

He leans against him briefly, encouragingly. Letting him know that he's saying just the right thing.

"I- knew you'd learned about your future. I didn't know what that actually entailed. I - god, I've seen what the mind does, on its own, without supernatural influence. That's what frightens me the most."