Their references fail to support all their statements. For example from the introduction, "In addition, "natural history" studies of free fall indicate that fa

Their references fail to support all their statements. For example from the introduction, "In addition, "natural history" studies of free fall indicate that failure to take or deploy a parachute does not inevitably result in an adverse outcome." Chasing down the reference for that statement points to the case of Vesna Vulović. According to wikipedia she a) was in a plane at the time of impact which will exhibit significantly different freefall characteristics to the human body and b) she "suffered a broken skull, three broken vertebrae, one crushed completely, and was in a coma for 27 days" which to me would be an adverse outcome. Further studies are clearly needed. I suggest animal studies in pigs.