[Daugherty16]

is to the safety or you and your loved ones. A service that might be rendered to others is not on that list, though it is somewhere on the overall list - but not under the circumstances you described. If your family or friends were involved that might change this evaluation, but you indicated these were all non-acquaintences. Just random gangs of dudes brawling in the street.

You can't immediately distinguish what is happening, who is on what side, doing what to whom, and your intervention is likely to either be useless or cause harm to yourself and/or to the wrong "side" in the altercation. There might not even be a "right" side. A CCW is most definitely not equivalent to an oath to protect and serve the general public, and you're not the MasterChief.

Fall back, drive through quickly, whatever to get some distance away from the melee. Call 911; but PK was right, your phone needs to be on your person and accessible. What if you fell off and couldn't get back to your saddlebags on the bike - how would you call for help while lying in a ditch with broken legs? Anyway, calling 911 is the smartest, and most likely, the only service you owe to your community at large.

ps. it might be better for the gene pool anyway to let some of these idiots kill each other off before calling the mounties...