I have to say that I cannot distinguish between the individual phases at all (at what point does each phase begin?).
I also can't tell when the twitches are voluntary and when they are involuntary. In the videos with the "failed" (or longer-lasting) hangings, the early twitches look as if they are involuntary, but they should actually be voluntary.
"Erotic hanging" reminds me of an idea I once had, I hope I can write about it so openly here:
Masturbate during the hanging process until unconsciousness occurs. Perhaps it is best to make the penis stiff and aroused before the hanging begins (or while standing on the chair) (women can do the same with the vulva

. Then, while masturbating and sexually aroused, look forward to losing consciousness (or don't look forward to it; ideally, the sexual arousal will already be so high beforehand
that the focus is on that and not on pain, fears, or anything else.
This leads me to the question of what you have to do to make hanging erotic (apparently this is a genre of its own in the fetish world).
This is not mentioned in the English Wikipedia, so I will take the liberty of quoting another Wikipedia:
"The mechanism of hypoxyphilia is not fully understood. The working hypothesis is that oxygen deprivation triggers a narcotic and euphoric effect in the brain. Simultaneous orgasm could trigger a dopamine rush, making the orgasm more intense. This combination is said to produce a high similar to a drug trip."
Source:
de.wikipedia.org
If one knew how to provoke such an autoerotic accident with certainty, it might be an interesting and easily accessible alternative to the benzos, alcohol, heroin, etc. discussed by some.
Does anyone know more or have any ideas? :)