From my understanding, your brain thinks it’s something that your body is in danger from, so your brain shuts your body down momentarily to prevent you from doing whatever it is that might hurt you. Like if you see blood, your brain may think you are bleeding, so to reduce your heart rate and slow bleeding down (even if it’s not you bleeding), it’ll knock you out to do so. It’s also why you can’t hold your breath till you die, your brain will shut you down to let it take over and reset everything to favorable conditions, making you breath again.
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