I've always struggled with the accidentally killed during an altercation scenario.
Firstly, because I'm not aware of any other accidental death case where 2 people are killed one after the other. Seems unusual.
Secondly, accidentally killing not 1 but 2 people AND hiding the bodies, setting fire to the evidence, and not coming forward. A normal person who accidentally kills would be wracked with guilt.
Thirdly, the sleeping bags are missing. Presumably they were used to transport the bodies.
Now, I've never tried this but I imagine it would be very difficult to get a deceased person into a sleeping bag. I guess you could unzip the bag flat and roll the body on.
But why bother. Why not just load them up? IMO it makes more sense that they were in their sleeping bags when they were killed. They might not have been asleep but keeping warm whilst reading a book.
If they were killed in their sleeping bags then that would explain the fire. Destroy any blood, DNA. JMO.
Pure speculation.