If a burglar breaks into my home and I find him in my office. If I have a revolver stuck in my waistband, am across the twenty foot room, while he is on his knees going through my desk drawers, it should be sufficient for me to say, "If you get up I will kill you with a shot to the head", don't you think? I realize I don't have physical control of the person but you can bet I am exerting one helluva lot of physicological control over his actions. Is that influence or control?