At the question, her oppressor(?) released her hold and took a few steps back from the girl.  She scratched her head as best she could with her helmet still on and seemed troubled, as if this were the first time questioning her own motives.  "Hm?  'Why I was interested?'  Well ya know, I didn't really even know you were a student until you told your summon spirit thingy to go away after I told you the rules."  She thought back to the moment when it had happened, crossed her arms in front of her chest, and nodded decisively.  "Mm, mm, that's right, we just started fighting because we were both bored with that weird dude from before, remember?  The only reason I spoke to you before that was because you looked so young I figured you couldn't be a student here."  She continued to nod to herself, as if her explanation could be the only correct one.  It might seem infuriating that such a dense girl could be so immune to things that should have sent normal people over the edge or have such power and skill with a sword, but certainly not any more infuriating than witnessing a girl who looked no more than 10 unleashing said terrifying things.