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lacius96
because you can't draw glyph in the dark?
Unless they've domesticated gold flare dragon, I don't see any reason why you'd choose that over a simple magic tool that acts like lantern, especially considering that light glyph is like, the most basic magic.
Even then, it doesn't really matter since witches are trained to draw glyph pretty much blindfolded to keep the truth from the unknowing.
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Nolonar
If I'm not mistaken, a Witch is supposed to erase the memories of all people who saw them perform magic.
They may be taught a simple glyph for erasing memories from the last couple of minutes, while Magic Security may be taught more advanced memory-altering magic.
That makes sense, actually.
People screwed up all the time and calling security every single time is not only a great inconvenience, but the delay might spreads the truth unnecessarily.
Though that brings up the question of why gramps doesn't have a good countermeasure against memory erase magic.
I mean, with that kind of things in play, you can pretty much rob a man blind and they won't even know.
Or maybe Qiffrey is just too competent and the normal countermeasure doesn't work.