I think sliding down the embankment is another scenario that should be considered. Given the significant flail chest injuries though and the force required to cause them I think the readers should still consider the likelihood of them receiving other injuries to head, limbs, spine etc. I am asking people to make their own judgments. Also to look up other reference information on falls, sliding down steep slopes. I don’t know if any research has been done on that.
Regards
Star man