Why did the girl kick my balls?

she and I where in our fitness class, this day of the week was for self-defense, we were chosen for a fight simulation so that we can practise on the moves that we have learned in the past classes. suddenely, she was focusing on my groin and she waited for the right moment and gave me a hard kick to my balls. at the begining i didn't believe ehat have just happened, because this girl was very cute and innocent and did not seem like thise mean girls who tend to hurst someone. anyway, i fell to the ground holdin gmy balls for 10 minutes and she was like happy that she took me down !!

iam so confused, would anyone please explain !!
Why did the girl kick my balls?
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