My personal experience. In high school this girl that I once shortly dated made a move on me again by sending letters. My current gf at the time found out. They arrange to meet in an empty classroom, I wanted to leave them alone to settle things. But my instinct told me to keep and eye on them. Their argument started becoming louder and louder until my gf at the time slapped the other girl. They both didn't back down and started to kick each other. Worrying that we might get in trouble I decided to separate them. Their beef was on going for few more weeks until they finally came to their senses and became cordial again.
Sometimes I fantasize if they would have agreed to settle this in my car or one of our room. But we were kids, we really did not have any private space to go to at the time. Looking back it was crazy how both girls were not able to control their hormones and territorial instinct. I think school also was like an environment where things like this can possibly happen since everyone is kind of finding who they are so they're bound to step in to each other boundaries. In more mature setting, it's probably going to be really hard to have a scenario that would end like it did.
Oh, buddy, cool, I have a slightly different story .. I have a lot of girlfriends and I always liked girls with whom I could fight and who did judo, sambo .. And in a parallel class I had two girlfriends, but they didn’t fight and they were engaged in wrestling. But they were insanely sexy .. I constantly hung out with them and constantly asked them to fight .. But they were shy .. At some point they started joking when we were walking that someone was superfluous .. And somehow at school , after the lessons, they again began to playfully argue with each other. I said which of you is stronger and more beautiful? They compared eyes, braids (they were brunettes), arms, legs (at first they were embarrassed again, but then they took off their shoes). then agreed to fight. We walked around the school, looking for a place, but someone was there, then we went out to the school yard and there was a lawn where tests and objects for military sports were held .... They took off their shoes and began not very skillfully trying to knock down a friend friend to the ground .. They fell, got up ... Then they fell and one of them did not allow the other to rise from the ground, they began to intertwine in their arms, lock themselves. ..They were already tired and angry,... Then they fought hard, and each wanted to defeat the other.. They began to swear, drooling flowed when screaming, the other screamed don’t spit, the bitch also spat... They went berserk..... And then two teachers who were passing by ran up to us .... Damn. .. I plopped down on the grass.... One physical education teacher, a woman. She screams to separate them. They fight..... Damn, I persuaded them for a week.... Bitch... Of course they fight...