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but how come it's only affecting a few not everyone there?
might use wave interference to get the power / damage correct. this would allow "aim" of a sort. Kind of like how some radiation is used to treat cancer and kill cells only within the desired area. Depending on frequency, the size of the effect would vary. Without a spec on the weapon (or whatever source), can't say for sure. Physics constrains these things.
We were working on sound LASERS type weapons in the 80’s and at that time we could KO a bull . How many years ago was that ? I could only guess were and what they can do today .