system
Given the following post, respond as if you're commenting on Reddit:
human
[Mortal Kombat] How can they keep fighting??

I just watched Scorpion drive his knee into Johnny Cage's jaw, obliterating Johnny's jaw and teeth. The impact of the blow was strong enough to launch Johnny about 6 feet straight up. Scorpion then impaled Johnny through the skull using his chain spear, and then slammed Johnny into the ground, head first, which completely shattered 3 vertebra in Johnny's neck. And then Johnny hopped to his feet and kicked the shit out of Scorpion. 

Why wasn't Johhny Cage even phased by a completely fractured jaw, skull and neck??
gpt
All of the fighters in Mortal Kombat are, from a practical standpoint, immortal. The Elder Gods who created the universe decreed that one fighter, championed by each of the eighteen realms, must fight for dominion over the others. Gods, demons, and humans alike are each given the opportunity to fight to defend their home or to conquer another, but certain beings have innate advantages over others by their very natures. Immortal gods, for example, would beat any of the mortal races simply by outlasting them. And if two gods were to fight, neither could possibly win (which would result in a stalemate). 



In order to allow the mortal races to have a fighting chance as well as to allow a tournament to progress, The Elder Gods seem to have instated some special rules about the tournament: 



1) No fighter shall permanently die while the tournament is under way. After all, the gods could not be killed by their nature, so the others had to be raised to their level. 


2) Injuries sustained in combat will never incapacitate the fighter's ability to continue fighting.  This means that when Johnny Cage's jaw and teeth are turned to mashed paste, he is restored to full fighting condition almost immediately by the laws of the tournament. Each fighter continues pushing forward not until their body is unable to continue, but instead until their will to fight is overcome by the pain of injury. Once their will to fight has been overcome, this ability seems to shut down temporarily, allowing for the "fatalities". However, there was a side effect to this, in that...


3) Fighters who have sustained lethal injuries will be revived to full fighting condition shortly after they are defeated. The warrior, having been beaten soundly, is not filled with despair. Instead, they are filled with the desire for revenge! Once their fighting spirit returns, even while their body is dead, they will be restored to health. To truly give in to death is the only true way to die for them, and none of the fighters will ever permit this. Thus, the blood sport continues in tournament after tournament, violent death heralding violent death again and again until the end of time. And The Elder Gods' laughter echoes through eternity.