Why do my berserk commanders disappear after winning fights

[NTJedi]

Originally Posted by Squirrelloid

99% of the time when i see a combat go to turn 75, its because the last remaining enemy units *couldn't* retreat. (Encased in ice, passed out and unable to get below 100 fatigue due to fatigue causing effects, etc...). Ie, incapacitated.

In the specific case of berzerk, eventually that berzerker rage ends. Generally, berzerkers are exceptionally tired when they come down from their rage. Its not unreasonable to say 'turn 75' is when this happens, and its not a far cry from being incapacitated.

Any other unit should have managed to retreat by turn 75.

From my experience it's been when the defender could not retreat while the supercombatant was killing the exhausted defenders/crippled defenders. I cannot even recall a battle where exhausted attackers or fleeing attackers were autokilled. As a result the perfectly healthy supercombatant is auto_killed instead of a more realistic solution of auto_retreat so the battle can continue later. Thus we witness an almighty legendary creature killed due to lack of game time!
Ideally the game should provide an instant retreat instead of an instead auto_kill as well as a game setting to adjust the auto_kill game turn. I'm sure many would increase the auto_kill game turn to at least turn_100.