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Overworked
Maybe he used his own mana this time, and as the teacher said, fireball consumes way more mana than fire arrow
I would say “he should’ve used the natural mana around him instead” but then that could’ve gotten carried away. A spell fueled from natural mana might have kept going even after he passed out (depending how this world’s spell construction works).
Why would you even show a child fire magic from the get-go anyway? One of the most dangerous elements.
Earth or water would’ve been far safer.