i don't think a static line parachute aka airborne has such a
function. If the main chute does not deploy upon jumping off the
plane, the dude has to immediately open the secondary chute and
pray for the best.
As for freefall, i'm not sure..... cause the chute's release is
based on the timing the jumper wishes to pull e string.
As for fainting while in the air, I think it's quite GG liao. Cause
you can't control your descend... means you're probably going to go
too fast/ hit tarmac/ or other seriously bad effects.