The reason people relax in when they receive major trauma is rather simple. When in the jaws of a predator any struggle will be met with further mauling. A limp prey will not receive further attention. This buys us time to think about a possible solution or for our mates to come in and save the day.
It is also important to note that humans are not the only ones who experience this relaxation during major trauma.
The reason this feeling of calm does not happen during minor trauma is also explainable. When receiving a flesh wound we tend to flinch away from the source of pain. This is the best response to stop further damage to our bodies. When you put your hand on a hot stove there is no time to stop and think, hence we instinctively jump.
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