Li Shenron
Legend
Sometimes I get the impression that people don't use morale anymore. That every monster fights to the death unless the adventure explicitly says otherwise. To me, that doesn't make a lot of sense. I mean, no intelligent creature stays and fights to the death unless it's got no other real choice.
I definitely don't run death matches all the time, but I don't currently use any hard-boiled "rule" to determine if an enemy tries to flee or surrender. Usually I just improvise it when the fight is going bad for them.