very silly of the dean/principle/dumbledore stand-in.
You tell the "muscle-headed armored princess" to destroy the target by "any means necessary" after effectively turning off her magic?
Saying "Use any means necessary" really cemented the fate of targets. They can bring dragon for the test or something like that, maybe it would become at least remotedly a challenge then
The head master was so wise, showing her that the academy appreciates thinking outside the box despite being a magic academy. I'm sure he's very proud of her creative decision! Sasuga, headmaster-sama!