Guys, Would you hit a girl if it was self defense?

I’m a freshman in high school and today we had three fights happen in less than an hour. Two boys fought, two girls fought and a boy and girl fought. Now the third fight was the big talk of the school because nobody could believe that this guy hit a girl. I have been friend with this guy for 4 years now and I have never seen him so angry. This girl was running her mouth nonstop and suddenly decided to hit him several times in the mouth busting his lip. He tried to stay calm but she just kept coming at him so he hit her back out of self defense. Do you guys think what he did was wrong or did he have the right to fight back.

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+1 y
I didn’t mention this but she also ended up breaking his braces and glasses
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+1 y
He tried to walk away from her but she just kept following him and trying to attack him
Guys, Would you hit a girl if it was self defense?
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