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At the state penitentiary, a cafeteria scuffle turns into a riot that leaves two inmates dead. The whole squad (except for Pembleton) starts to investigate, but no one - including several killers apprehended in previous episodes - is willing to provide any information. Bayliss concentrates on inmate Elijah Sanborn, trying to use the news of his son's recent arrest as leverage to get the facts, but the truth only comes out after a second assault occurs in the prison. Meanwhile, Pembleton begins target practice in hopes of qualifying on the firing range so he can return to full duty.