Once again, instinct would probably warn him about the gun. He managed to navigate a long path filled with every magical trap imaginable, and he just sort of knew what to to to avoid each trap. And when he encountered a particularly dangerous bit of magic he responded my subtractive magicking it despite not having any way of knowing he should have done that (or knowing how to call on his magic at all).
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MMBN style fighting game made by me in the link below!
http://sandbox.yoyogames.com/games/184947-b8bn