Basic Trope: After fighting his way to the final villain, the hero lets the villain go to avoid the guilt of killing him. * 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." * Justified: 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 kil