The most ELI5 explanation is that you are walking bag of meat and electricity, and when your meatbag takes a huge blow sometimes the electricity goes wild.
A little less ELI5 is that it’s a reflex that happens when your brain stem takes a traumatic impact. It’s called the fencing response.
A lot of the stuff that the body does is controlled by the brainstem actually, so when it takes it an impact it can manifest in a reflex. Similar to the knee-jerk reflex thing, which is more spinal cord related.
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