I was going to say I see this with mostly women from around the Eastern Block of the world becuase those women just have no fear. But the more I think about it. No.
Many women just have no fear of a man taking a swing at them. NOT all but I have seen this thru my life. A small woman will take on the biggest man if her anger is in the red zone.
If its because they think deep down that most guys will not swing at a woman I'm not sure.