[Jon glances at him, really really not sure how much he should tell Martin. Then his eyes go back to the puppy in his arms. It's easier when he isn't looking Martin in the face.]

He took you down to the Panopticon - it's, uh. A device, in the center of the tunnels. Millbank prison. He wanted you to use it, and... I think you said no. So instead he... Took you into the Lonely's domain.

I. I followed and. [He sort of raises his shoulder in a shrug, like yeah he doesn't wanna SAY it but he did kill Peter.] Stopped him and. Found you. I took us back home.