http://www.ncbi.nlm.nih.gov/pubmed/6423473
The only think I can think of is that they were able to determine COD by the chemicals in their lungs. I don't know if a body would need to be completely intact to determine that though, or if they could still determine it from what was remained but not intact. If they had died from the blows from the hatchet their bodies wouldn't have taken in the lethal amounts to cause smoke inhalation. Like how they can tell if a person really drowned or had been murdered elsewhere by the water in the lungs.
I don't know if that makes sense.
The only think I can think of is that they were able to determine COD by the chemicals in their lungs. I don't know if a body would need to be completely intact to determine that though, or if they could still determine it from what was remained but not intact. If they had died from the blows from the hatchet their bodies wouldn't have taken in the lethal amounts to cause smoke inhalation. Like how they can tell if a person really drowned or had been murdered elsewhere by the water in the lungs.
I don't know if that makes sense.