Judgment shooting drills are used to train an officer in shoot/don't shoot situations. Among the best are the FATS system which has a video screen. The officer's gun has a laser (to show the point of impact). Depending on the officer's action, the trainer can control the actions of the images on the screen.
Had one where there's a disturbance at a home. You go up the stairs and hear an argument. Once in the bedroom, you see the man with the knife threatening a woman. Several outcomes. He charges her and you must shoot him before he stabs her. You may assert verbal commands and he either complies or attacks you. Say he complies, the woman victim pulls a handgun out to shoot him and now you must shoot her.
Had one where there's a disturbance at a home. You go up the stairs and hear an argument. Once in the bedroom, you see the man with the knife threatening a woman. Several outcomes. He charges her and you must shoot him before he stabs her. You may assert verbal commands and he either complies or attacks you. Say he complies, the woman victim pulls a handgun out to shoot him and now you must shoot her.