Parental duties are taken seriously by our son. He has their children every other week end and visits two nights a week.
He arrived and things were satisfactory. About the time she was to leave to go out a return time was discussed and she declared she expected to be much later than they had previously agreed. This was not really acceptable so he said no and an argument ensued.
An impasse was reached and he decided to simple leave. This was met with a physical assault. Gripping him forcefully around his neck and refusing to let go. He said OK he would stay to escape the situation and made his way to the back door and was followed and hit. His path was blocked so he returned to the front door and got out. He was followed into the street where shouting continued and more physical abuse ensued. He did away finally.
The disturbing thing is their children witnessed the whole event.