Hyperventilating seems to work. There are many people who have played the chocking game and died, which requires the person to hyperventilate before chocking themselves until they lose consciousness. https://en.wikipedia.org/wiki/Choking_game
Breathing and swallowing can be uncomfortable when the rope is tight, I breath in when practicing and it seems to work well as it is easier to not breath for the 10-15 seconds needed.
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