i don't have an opinion on goetz's innocence or guilt one way or the other; i don't feel i'm informed on the incident enough. it's between him and his Maker.
regarding the original question, i believe the rule of thumb when confronted by multiple attackers is to turn and run. if they pursue you the odds are pretty slim they'll reach you at the same time. in this way you can deal with them one at a time - whichever one is the fastest runner first. and if they don't pursue you then you avoid the conundrum.