Fight Me

"The least you can do, princess, is ask nicely." the other girl countered. Evie's eyebrows furrowed at the pet name and her foot stomped lightly against the floor.

"I shouldn't even have to ask! It's common sense to use the cubicle best suited to your needs! You shouldn't even be in here if you're drawing!" she exclaimed.

"Fight me, this is a public space!" the purple-haired girl growled, standing up from her chair to face Evie.

Evie heard the smack before she even realized what she did. As a matter-of-fact, everyone on the first floor of the library heard the smack.
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Alternatively,
The one where Mal says "fight me" too often, and it finally bites her in the ass...