Here's another story about "gravel bullets". I used to work for the provincial power utility (retired now) and a few years back we got a call one day about a line contact. A tandem gravel truck contacted a 14,400V power line when he raised his box to dump his load. The electricity arced over the tire to earth and as it did so, it damaged the tire sidewall enough to cause it to blow out. The truck was parked on a graveled hard surface and there was a van parked a dozen feet away, along side it. When the tire blew, the force of the air released blew a considerable amount of gravel off the surface and literally peppered that van from one end to the other. All windows on both sides were blown out, and the sheet metal was totally destroyed by the hundreds of rock hits that severely dented it and in many places the paint was knocked out of the deep dents. There were even holes in it from the odd larger sharp edged stone. I have no doubt that anyone caught by that blast would have been severely injured, and possible killed.