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Xachariah comments on Harry Potter and the Methods of Rationality discussion thread, part 8 - Less Wrong
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You're making this too complicated. As evidenced by the levitate-slowly-to-the-ground spell, they've already got magics in-universe that impede the maximum kinetic energy of an object.
Just surround the entire area with a field that inhibits maximum relative velocities to something an arrow could achieve. No more guns, no more bombs, no more nukes. Problem solved.
I assume that at a certain power level, even magic can't protect you. Atlantis at full power probably couldn't defend itself against, say, a gamma ray burst, a black hole pulling the solar system into it's gravity well, our sun going supernova, or heck, the sun just expanding due to old age.
A spell to protect against incoming shockwaves would probably require vastly more energy than a spell that targeted and halted igniting charges. Although ironically it seems much more muggle thinking to halt a theat with through intricate understanding of the mechanisms than to just pump more power into it.
Not to mention whatever it was that destroyed it.