I thought that was a given, however one doesn't preclude the other at present. Since I'm only vaguely familiar with this, the frequency based thing may not be an alternating frequency, but the actual electromagnetic frequency electricity uses, i.e. the wavelength. That's about as specific as I can get, since I'm not a scientist. Something like a continous EMP that somehow doesn't damage equipment. As I'm thinking, the possibility that this could have been a weapon designed to immobilize a country without damaging the assets in that country. Your own troops would be outfitted with amulets or similar devices so they could operate unimpeded. The 12 (I think at least 13) people with amulets suspected or knew that the test was going to be a bust and prepared for the worst. Just wondering why they didn't go back and turn it off, unless in close proximity it DOES affect people and you need the power of 12 amulets to get close to it.