AVClub: There’s a pivotal scene in “Alma Matters” when Sherlock sits down with Nieves to discuss why Nieves is taking the fall for a murder Sherlock knows he didn’t commit. Sherlock makes clear he has nothing but contempt for murderers, and can’t fathom why, regardless of money, Nieves would agree to make a false confession. First of all, Lily Cooper was his friend; second of all, by confessing, he’s shielding another murderer from justice. Sherlock leans hard on the guilt, and a little on Nieves’ frustrations with being a fall guy, but Nieves never actually admits anything. Instead, he shrugs; he imagines that guy didn’t have much choice, either.