The younger man tripping over him barely registers through the agony. Dr. Klim gasps, turns to meet the other Tribute as the most recent wave relents. It his last moments of clear thought, Sigma is grateful it's a friendly face that would witness his end, though a quick death from a sword would have been almost kind. Sigma's eyes meet Neffa's briefly, weakly, before another wave of pain seizes him.

He recognizes Neffa's plan, understands that the fellow magician would be in danger if he screamed, and so he buries his teeth into his cybernetic arm - as the worst of it comes, he bites down so hard that his artificial blood bursts from the wound, soaking his blue sleeve white. Sigma's teeth audibly grind metal. Memories of his amputation spring to mind, so sharp and vivid he feels as though his eye is again being plucked from its socket.

When finally the Doctor can breathe again, he removes his mouth from his arm and the 'wires' that make up his nerves spill through the holes in the fabric like fibreoptics. He rolls onto his back and stares at the sky unseeingly.

"Same," he gasps. He hadn't watched Ariadne's execution very attentively, but he remembers what that Penny woman said about the drug. "Same poison-" He has to take a breath. "As-" He can't form another word. When the next spasm comes, Sigma still stubbornly refuses to scream: this time, through the pain, he begins to weep.