I'm not sure how fainting works, but fainting looks to me like an energy crisis, so kinda not surprising the results are the same.
I've had two complete blackouts due to Ventricular Fibrillation, and one near blackout where the VF stopped after nine seconds (as reported by my ICD). In my experience, vision and thinking seem to stop at the same time, with increased dizziness being the first functional effect (after perhaps 7-8 seconds). My ICD is set to fire at 14 seconds, by which time I'm guaranteed unconscious and won't feel the painful shock. It takes 2-3 seconds to recognise the warning signs (painless fluttering sensation in my chest), so there are 4-5 seconds of normal consciousness when I can try to make sure I fail safe. Like sitting down.
This is why I don't drive anymore.
I'm not sure how VF works, but maybe the deficit of oxygen develops much faster, so it leads to complete blackout in seconds?
> there are 4-5 seconds of normal consciousness when I can try to make sure I fail safe. Like sitting down.
Fainting and workout take more time. Definitely more. When I fainted it took tens few minutes from the moment I broke my leg. When I ride my bike up to a hill with all my might, it takes a couple of minutes to see darkness in my eyes.