Arthur's face falls to sobriety as Sheehan talks, but his hand pulls back now, just so he can adjust himself and sit up a bit straighter.

But he still has to take a deep breath, before he replies. "I know how that feels, doctor. To... to not be able to trust the world around you, t-to doubt everything your senses, your mind is telling you, because... because something else is toying with it."

He shifts so he can touch Sheehan again, grip his shoulder and give him something to focus on. "I don't know how much it helps, right now, but- you are here, doctor. This is real. You're here and you're safe."