A short story published in one of the well known Sci-Fi magazines- I believe in the 1950’s. The bad guy is able to control people’s minds. He decides to kill a good guy and announces to the victim that he will, at a later time, force the victim to shoot himself. The victim rigs up a gun that shoots backwards at the holder. As the bad guy forces the good guy, through mind control, to point the gun at himself, the good guy struggles to keep his mind clear and not give away his plan. He points the gun at himself, pulls the trigger, and the bad guy is killed as the gun fires backwards. Super cool story!