If you mean actually seen for myself, it was in a go-go bar in Songtan, Korea. The girls were both dancers although one was just visiting the bar on a break. Both were in very tight, short dresses and stiletto heels. Typical "work" attire. They started arguing over whether one owed the other money (I asked later) and quickly both stood up and grabbed double handfuls of each other's hair. They pulled for a minute until both were bent over at the waist. Then they began exchanging kicks to the crotch and womb with an occasional thigh block. I was maybe a foot away from the action and knew both girls fairly well. After a dozen or so exchanges one girl landed a really solid blow to her enemies cxnt and down she went. The kicker immediately pressed her advantage and began kicking the girl on the floor as often and as hard as she could until the security came over and broke them up.
It had nothing directly to do with the fight but I ended up dating the winner for a few months. She was a bit too unstable for me though so it didn't last.