See? That's why we don't fire spells willy-nilly on campus outside the training, arenas, and target ranges.
Then there's our expectant "who's going to pay for the damage?" It'll be a load of bs for all those involved and the readers. "Oh, lemme just magic that clocktower back to normal, barely an inconvenience." Y'all shoulda magic-proofed every building if ya not gonna to enforce magic-regulation at the magic school and permit "open spell casting." Doubly so, if you're enabling social classes and magical "power harassment."