Supposedly, if surrounded, and there's no way out, you go for the weakest guy in the gang, rush at him, do your worst, then go around the back of the other guy, do your worst, then go back through the center of the circle, repeat; keep moving, be on guard, and don't let them catch you off balance.

Cheap shots are not cheap if they save your life.
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Supporting Sanchin31 as he says "Nuts to cancer"