I just watched a movie (ya, you gotta love Hollywood) and here is the scenario:
Bad guy is a prisoner being questioned by the military. He is not shackled in any way. Distraction happens and BG rushes guard, steals his 1911 and grabs a female civilian who happens to be in the room. (OK, not realistic, but this is from the 1970s so work with me) He is standing behind her with the gun pointing at her head through the bottom of her chin. It is obvious that the safety on the 1911 is engaged. You are not far from the two of them, less than 10 ft. Let's say the woman is your wife/daughter. What do you do?