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"We taught Blood Magic alongside Life Magic around… five hundred years ago I believe. However, we instantly stopped after a certain incident killed a child…" mother said with a sigh as she covered her face.
Damn… to think Blood Magic could get that out of control… I guess my mother was right in certain things.
In a fight against an opponent, it can easily be stopped. But how about playing around with someone else, or in a friendly spar where both mages only try to take on each other's magic using barriers?
Apparently, unlike other elements, Blood Magic didn't show a visual response of any sort. Blood Magic controlled blood but doesn't create it, or at least not in the low tier spells which cause all these problems.
So, while the children play with it and try to see who's stronger by taking magic attacks with shields, which commonly happens as friendly spars accepted in the academy to settle down rivalries or even as tests, Blood Magic ends up being deadly and dangerous.
Check "The Protagnist's Sister Is Actually the Strongest"!