Ahem, this is something I really can address! A nurse witnessed my horrific car wreck, saw the devastating head injury up close (serious skull fracture from enormous force of impact and loss of soft tissue to the bare bone), checked for vital signs, and finding NONE, called for an ambulance for a DOA. Hospital ER prepared for a DOA. When I arrived in the ER yucking it up with paramedics, many physicians on the premises came to the ER to see the wound and the "talking dead woman". They told me they had NEVER seen anyone hit so hard in the head and suffer so serious a head wound and live. Not only did I live, I did NOT have significant swelling. They monitored extensively, waiting for "delayed" swelling. Nope, nada. An anomaly, yes. What I DID have was significant neurological impairment; took me about a year to remember who and what I was most of the time, and took about 18 months to learn to read again.
So you have to be careful with those kind of "leading" statements. :|)