My guess is that those are the only wounds that are visible on the bone. On most of the rest of the body the bones are protected by soft tissue.
Maybe but I don’t think there’s that much soft tissue protecting the hands.
Maybe they were stoned, then digged up for some reason?
http://en.wikipedia.org/wiki/Stoning
That would explain why there wasn’t any survivor able to come back later to bury her comrades (if you curl you up I’m not sure how a hailstorm could be lethal to everyone in a big group)
It seems intuitive that you protect your head with your hands and arms, as sudden as the hailstorm may have been, and once they collapsed to the ground their whole bodies should have been hit (although I guess their clothes could have protected them a bit) ?