Don't lose sight of the fact that the fella who deployed the parachute whose account is linked in post#6 had an undiagnosed/unexpected blackout and when he came to not only was he 'plummetting' but his right leg had gone numb. (And he subsequently turned out to have a brain tumour).
It is a fact that major incapacitating 'strokes' can often be preceded by mini-strokes:
IMHO he did the right thing to pull the plunger: who was to say he wasn't going to have another (pretty big; totally incapacitating) stroke while he was b*ggering about in naff visibility trying to sort himself out, with the adrenalin surge the event was causing shoving his blood pressure up still further?
I'd have pulled too.
Cusco
