Actually, the woman who stopped her car attempting to intervene clearly made the situation worse.  The fact that she trailed the dude in her car was incredible provocation.  If the guy was psycho and had a gun or knife or baseball bat, the intervenor may have ended up dead.  It is not wise to aggressively enter an unknown situation.  The fact that the man is not charged in relation to alleged assault of his woman friend proves that the police found no evidence of injury at all.  If they had, they would have added assault to the charges whether the woman wanted them or not.  Praise the intervenor and we will get more deadly incidents.