Hier der Text, den ich im SW SRD gefunden habe:
"Morale
Certain monsters, such as mindless or undead creatures, are fearless and always fight to the death. The majority, however, will not continue to fight a hopeless battle; they will seek to retreat, flee, or surrender. The Referee decides when monsters abandon the battle and retreat, based on the situation and the monsters’ intelligence. Keep in mind that the party’s own non-player-character allies might decide to fl ee [sic] if their prospects of survival look grim."
Wichtig ist ja vor allem, dass die SL angehalten wird, diesen Aspekt anspielbar zu machen.
Folgende TSR editionen bieten dann halt konkretere Prozeduren und beschreiben explizit was bei Gary, Dave et al. implizit war.