i was in highschool and like said its usually because the other party cant keep its cool. so fights are usually individuals. assuming that they still come at me after i let them get out of a submission, i think i could still get them into submission hopefully
even if its one vs many i dont think knowing boxing or muay thai would make any significant difference. lets be realistic here have you ever beat the crap out of 2 or more person attacking simultaneously?
for me if thats the case there is always running away