The evolution of pain.

[Aoi Magi]

But in case of paralyzing pain it actually hinders our ability to get away from the source of the stimuli or find some other means of easing it. What's the point of a warning if all escape routes are already blocked?

Maybe it's more to do with the healing than as a warning system per se... fear warns of danger but pain signals something else? So maybe extreme pain is just effectively saying 'you cannot afford to do anything else other than wait for this to heal/subside'... saying essentially that movement itself could be causing more damage.

Evolution is stupid