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This might be a little old and settle business but I think there is a scene, in StrikerS, were they did explain that. When Nanoha blast Teana with the CrossFire. It was later mention by Shamal how Nanoha is able to control the effect of any magic bullet attack she use to stun and not cause real harm (It was also mention that the reason why Teana faint from the morning until the night was because she wasn’t getting enough sleep in the past few days to train more). So this was Nanoha’s way of teaching Teana to not screw with her own magic bullets which were level as lethal since Subaru almost get hit by one and Vita tell her that if the thing hit her it would be lethal.
They never go in to detail of what is what but I think it can be assume magic does kill unless you control how the spell will affect the body that hits. Still doesn’t explain how is that magic can break stone, metal and almost anything but not make the poor humans on their path just a pile of dust but is the most close canon explanation we have
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