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It's Bob's job to be tortured to help assess his agency's interrogation effectiveness.
Bob acts polite to his prisoners doing thing like casually chatting him them, offering them good food, and accommodating their wishes and needs. All the while he records anything important information they slip out, and quietly reports it to his superiors.
Subverted: Bob is a very skilled interrogator who is able to trick prisoners into revealing any information he wants through clever psychology without causing any physical or emotional harm to them.
Double Subverted: After he used the harmless psychological method, he proceeds to torture the prisoners to verify the information.
Zig Zagged: Bob tortures people, but he uses very innocuous methods to keep from harming them physically and emotionally, but this is to wear down their psyche to break them more thoroughly and to sate Bob's subtly sadistic tastes, although he genuinely does want to see his victims returned home and to their families relatively unharmed
Averted: Bob doesn't torture people, and isn't a torturer.
Enforced: Bob is the main character in a production meant to cater to the S&M demographic.
Lampshaded: "You know that Bob is not such a bad guy. Even though he tortures people. He just loves him some torturing people..."
Invoked: Alice hates Charley, so she frames him for a crime which is patrolled by Bob's agency, knowing that the "interrogation" is inevitable.
Exploited: Alice, interrogating Charley, says she's getting tired of no progress, and implies that she will hand the interrogation over to Bob. Charlie cracks immediately at the thought of being in Bob's torture chamber.
Defied: The Police Commissioner knows that the crime plot will need to be solved, but sends Aluce after criminal mastermind Charlie instead of Bob. The reasoning being that the department can't take another news exposŤ revealing another incident of Bob's police torture.
Discussed: "Ugh! Again with the bastard who tortures people!"
Implied: They leave Bob alone with the mooks who are never seen on screen again and he comes out with the information. The methods are ambiguous but others accuse him of being a twisted creep.
Bob isn't the sadist everyone thinks he is. He feels pity for his victims and remorse for the horrible things he has to do to them as part of his job. Because of his gruesome profession everyone is afraid of Bob, including his teammates. No one wants to have anything to do with him. Bob is a very lonely and depressive man.
Bob brags about his "craftsmanship" but really he is a clumsy bully who only knows how to beat people who are tied up.
Reconstructed: At the end of the story, Bob finally comes to terms with his troubled psyche, knowing that those few hours of torture had saved thousands if lives. His friends stop fearing him when they realize the he did what he had to do.