- Straight: After Keith, the villain, killed several people, Bob, the hero, fights his way to Keith. When Bob has Keith at his mercy, he lets Keith go, after Alice, his girlfriend, begs Bob not to "sink to Keith's level".
- Exaggerated: Keith has personally tortured, enslaved, and massacred millions of innocent people, and Bob lets him go after Keith merely says "I'm sorry, I can change."
- Downplayed: Bob chooses not to hit Keith after Keith hits him, feeling this would lower him to Keith's level.
- Keith was being controlled by a dangerous entity, and if Keith is killed, the entity will merely possess Keith's killer instead.
- Keith killed his victims as an act of revenge against his victims, who also killed as another act of revenge. If Bob were to kill Keith, the Cycle of Revenge would continue, and Bob would be yet another link in the bloody chain.
- Bob and Keith are similar in many ways; the only thing that really separates them is Bob's moral code.
- Alice begs Bob not to sink to Keith's level... By torturing and killing him.
- Alice tells Bob not to kill him, even though he could never stoop as low as him. This guy has feelings and it would be bad, though not as bad as what he had done.
- *Smiling, holding several Noodle Implements* "Oh, I won't kill him. There are better things to do to him..."
- Bob decides to Make It Look Like an Accident after careful consideration of how to make it plausible. As a result, it can only be speculated that Bob had anything to do with it.
- Double Subverted:
- Alice corrects herself: Torturing or killing.
- When he refuses to hurt him, she says that she is proud of him, and that she didn't want to frighten him, but that he would have gotten just as bad as him.
- Bob thinks about it, realizing that inflicting inhumane torture on any sentient being, even Keith, is something that will haunt his conscience forever, deciding not to go through with it.
- Alice begs Bob not to sink to Keith's level as the camera pans across the hundreds of soldiers Bob slaughtered to reach Keith.
- "Well, shit. Can I at least break his legs?"
- A moment after Alice begs Bob not to sink to Keith's level, she found that Keith's attack also leaves a scratch on her brand new car. And she tells Bob "Just kill him, NOW."
- Bob kills Keith, and instantly morphs into an exact copy of Keith.
- Zig Zagged:
Alice: "Bob, don't kill him. Don't sink to his level! I don't think you can live with his blood on your hands!"
Bob: "Okay... hey! Wait a minute! I just butchered my way through 500 of his minions to get to him! What's one more life to me now?
Keith: "Bob, forgive me! I know nothing I say or do could give you your dead sister back, but I am truly, truly sorry."
Bob: "OK!" (turns to leave)
Keith: "Fool..." (Offhand Backhand) "*Hurk... bleagh*"
Bob: "Oopsie... Darned reflexes."(smug look)
- Averted: Bob kills Keith without flinching.
- Lampshaded: "Are you really comparing me to Keith after what he's done?"
- Invoked: "What will make you any better than me if you kill me? We're Not So Different, when you think about it."
- Exploited: Keith realizes that no matter what he does, Bob won't lay a finger on him. He seizes the opportunity to perform evil while Bob is on duty, as to not be interrupted and to watch smugly Bob helplessly staring at him.
- Bob gives a speech as to why he is justified in killing Keith before doing so. Zach is impressed with Bob's justifiable decision.
- "I have to kill him, it's the only way to be sure he never does it again."
- Zach: "If not killing Keith means him continuing his psychotic crime sprees, I sure as hell would rather not be a wide-eyed dumbass like you!"
- Bob lets Keith go away, only to have Keith's henchmen kill their bad boss instead.
- "If you have a chance to kill Keith, would it be right?"
- "Wait, you're going to fight your way to Keith and then just let him go?"
- Conversed: "Ugh! I always hate how one hero uses the whole "don't kill him or you'll just be like him" speech on the other hero. It's so annoying! Just kill the bastard already!"
- Keith continues his reign of terror, and when Bob and Alice return home, instead of being welcomed as heroes, they are demonized, condemned, spat upon, called disgusting words, and later are tried and executed for dereliction of duty and extreme negligence.
- Bob let Keith go. Unfortunately, Keith was beyond redemption and the only way to prevent him from doing evil again was killing him. So he continues wreaking havoc upon the town & some people blame Bob because he didn't kill him when he had the chance even though he just wanted to avoid being evil in his-own eyes. Zach scoffs at Bob for "proving that traditional heroes are stupid, and Alice for her beliefs holding Bob back. He goes on to kill Keith himself, earning the credit for finally ending the latter's reign of terror.
- Keith is moved by Bob's gesture of mercy and reforms. Zach was not convinced, however. He leaves the town, unwilling to stick around to see if Keith's Heel–Face Turn would stick.
- Keith is taken down by a Karmic Death or Bad Guys Do the Dirty Work instead, leaving Bob's hands clean.
- Keith is simply taken to prison (or fictional equivalent of thereof), where he spends the rest of his life, harmless to society.
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