Lots of "valid" tactics are chickenshat and cowardly, just saying.
You have some blurb about "gunfighting" in your sig... in that theme, ack running is no different than challenging a man to a gunfight, then turning and running while your buddy draws down on the other guy with a rifle from the saloon window. Yes, it was a valid tactic to let someone else do your fighting for you. It doesn't make you less of a chickenshat coward, however.
Ack running from a horde of gangers all fighting to see whick one of the 4 or 5 of them is gonna kill ya first is different. Running from a 1v1?
Pffft.
Nancy.