If a man hit your sister when she hit him first, what would you do?

Many people have a stance that today that if a woman hits a man, the man has every right to retaliate back and hit her. EQUALITY after all #feminism.
If a man hit your sister when she hit him first, what would you do?
But let's say if it was your sister that gets into it with another man or her boyfriend. Things get heated and she starts attacking him by hitting him. Low blows and everything, she's hitting him all over the place. The man gets angry and hits her and does a good deal of damage. What would you personally do? Since she technically did hit him first. Do you just let it go or do you beat him up?
Let it go
Beat him up
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If a man hit your sister when she hit him first, what would you do?
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