Reminds me of the time I intervened in a drunken domestic dispute. The guy was slapping his girlfriend around, and had bloodied her nose. When I tried to get him to back off, they both jumped on me.
I have learned from certain neighbors years ago that in such a domestic “dispute” the woman thinks it is right that she get beat up or even killed by her husband or boyfriend and any outsider is interfering in a domestic expression of love and should be beaten up for that.