That's just a school fight, that's actually normal. It's normal for people to get hurt during a fight, and to feel guilty about it (e.g. wondering if they could have handled it differently, if it was worth it).
That's not what happened to Connie.
Connie just bumped into someone, then somehow her fighting instincts activated and she somehow threw someone.
I would have actually liked it better if she got bullied, and then accidentally fought back too hard because she's used to fighting tougher enemies, or just used to fighting in general instead of talking it out.
She could have had a moment where she questioned what all this training was doing to her attitude/mindset towards people and conflict resolution, that would have been nice.
Instead we got her panicking because of a freak accident, and then her learning how to calm herself down by ignoring it.