Mason was a red who had been in Knox's tribe. He had been chained and tortured by Knox, who used him to test newcomers to determine whether they could join the tribe or not. When Ruby and Vida are pitted against him in Never Fade, the former looks through his memories and reminds him who he was — not just the shell he had been forced to become in Operation Jamboree. As soon as he had this realization, and returned to himself, Knox shot him.

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