thedeathproof--hi, how are you?
In my opinion (if I completely understand your question), no mortal should ever believe they are incapable of physical dying.
We are all mortals; a basic fact of life is that we all have to pay our bills, and get used to the idea that our bodies will , one day, fail; and we will be physically dead.
Our bodies are marked for "planned obsolescence"--we have an expiration date; we just don't know when.
"Defying all explanation" and not dying does not make anyone "deathproof."
I've had some incredible experiences with this myself--I should have been dead--
but it was a no go for me.
We all physically die when it's time; and not before.

If you don't mind, I send you hugs, and a HUGE Welcome to P.C.---theo