Explosion just means there has been a radical reaction basically, why assume there's some kind of extraterrestrial magic involved? I really don't get that assumption, nor line of reasoning. It's the least likely explanation, let alone a realistic one.
It actually isn't a strong pro-alien argument but just one against the standard guess of people just bending the crop in a mechanical way. As it seems that there were no unusual chemicals the only explanation that remains at first sight is radiation which when looking at all the examinations seems to be an explanation that fits...
