Before you even see her come towards you there is only air where you were standing. You bolt out of the house faster than you have ever ran in your life. Even after you reach your friends you just keep running.
They come after you begging you to stop and when you finally do, they ask what happened. You explain what you saw and, expecting horrified faces, are greeted with laughter as your friends tell you to tell them the truth.
"A girl beating a guy? You honestly expect me to believe that?" one friends laughs.
You scream that it's the truth, that someone needs to call the police but your friends continue laughing. Continue disregarding the notion that a women overpowered the 'strong' male.
After a few minutes you give up and tell them you're going home.
Maybe your parents will believe you.