This behavior is deplorable. I'm with just about everyone here that I would have intervened. I'm a large guy and well trained when it comes to physical encounters and I wouldn't have hesitated to level those 2 women. I can tell you now, those two have never been tossed around like I could have and they would not have fled the scene.
I understand letting 2 people settle a dispute physically, but when it becomes a 2 on 1 mauling you have to step in. This is how those 2 women should have been treated:
http://www.youtube.com/watch?v=5rkQwyfCn6A