I have no final answer, but I'd be tempted to follow @Living sucks' vision.
What I do know:
- the magnitude of the contortions, at least the start, from what appears on video (pilot stuff), could certainly make you fall from a chair or change position on a sofa, uncontrollably. For this reason, I believe it would be more secured to lay down, but that's only my opinion... This way the body would be sort of blocked by the press of the flat surface, so I'm doubting that various muscle/body parts' contortions would add up / couple enough to make the neck / head turn for the mask to collide with the environnement, thus displaced (but still not guaranteed). Otherwise, if falling on the ground, or against the back or sides of the sofa / bed if sitting inclined ...humm I just dislike the idea
Else might wanna acquire one of those pilot seats with all the straps ;)
View attachment 36426
j-k : not yet available at the R2D site hah
- about the order, the contortions seem to start triggering at around the exact same time of the loss of consciousness, then they could last a couple minutes, between 1-2 in general (judging from exit bags anyway) or much longer at worse (happened with Dignitas). I'm just unsure if they'd modulate in intensity, or on the contrary calm down. But from what I read, I didn't have the impression, it wasn't reported, so more like steady ? Can't tell. Most were reported as weak but that goes against the beginning of what I observed from videos. Considering the Dignitas recordings, the contortions will finally end up to pause, then a calm period occurs before death, where mostly the respiration is altered hurtfully.
Apparently, serious brain damage happens especially at the final stage, shortly before death... maybe during that collapsing phase ? Maybe the end of the contortions also comment on the neurological state, I'm not certain (broscience like would say Notabadguy).
Indeed, this leaves wondering, if a solid leak would happen earlier from the equipment during the contorsions, would you slowly recover and voilà ? I give my tongue to the cat ! (french expression meaning I donno). If the leak was light, maintaining you into "thin air" like the mountain climbers, it's my assumption that it may be sufficient to maintain you in a "vegetative" state, then in all cases > effed, even if the death was prolonged, I hope not "starving"/dehydrated to death, but from misc complications before (pulmonary or cardiovascular), without suffering
Take your bets :/