Occasional defense refers to the fact that the victim is or is about to commit illegal violations against the defendant or another person's body, but the defendant does not realize this subjectively. The use of force against the victim for the purpose of illegal violations has objectively played a role. The effect of personal defense. According to the above definition, which of the following acts is not accidental defense? ['A has deep grievances with B. One day after the conflict, A goes home and takes a pistol to kill B. The two happened to be on the road. A shot first and killed B, but B did not know when he shot. The pistol in the right hand has been caught in the pocket and is preparing to shoot it.', "When A was preparing to shoot B, C shot a shot at A later and killed him, but C did not know that A was preparing to kill B at the time of the shot, which was purely for the purpose of revenge and resentment. A. which protects B's life.", 'A fierce clash between A and D was drunk, and the two hit each other on the road. When A was about to pick up a roadside brick and beat B, some people in the onlookers shouted "the police are coming. " A was frightened and accidentally fell off the road. Bianhegou drowned, B is safe.', 'A is wearing a police uniform with an electric baton, posing as a police officer to "grab". When A catches B and searches, B flees after being injured, and A fails to succeed.']