If you think about it, feeling less actual pain is necessary.
For example, you are alone at your home and bump your little finger on a chair, it hurts like hell.
But in a warzone, or if you are fighting for you life with a a animal attacking you, or if you are fearful in a certain situation, you can get shot, stabbed, break bones, and still function much better (of course, to a point...) than when you hit your finger in a chair... Not because you are pretending to have less pain, but because if you feel pain now, you die (after you are "safe" you can feel your pain later...)
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If you think about it, feeling less actual pain is necessary.
For example, you are alone at your home and bump your little finger on a chair, it hurts like hell.
But in a warzone, or if you are fighting for you life with a a animal attacking you, or if you are fearful in a certain situation, you can get shot, stabbed, break bones, and still function much better (of course, to a point...) than when you hit your finger in a chair... Not because you are pretending to have less pain, but because if you feel pain now, you die (after you are "safe" you can feel your pain later...)