Step 1: Grab attacking person
Step 2: Push person on the ground
Step 3: Wait untill they either calm down or are too exhausted to keep struggling.
		
		
	 
^This is a pretty good answer.  Barring this being an effective answer, I have to think of my approach like Star Trek...
First of all, Prime Directive:  Females are an alien species.  Perhaps what I've seen is indeed unprovoked, or perhaps I misperceive.  :raises Spock-ish eyebrow:  Hopefully, I can stay out of it.  If I sense my wife/girlfriend is capable of handling the situation herself and quickly, fine (say, if w/gf is a black belt in tae kwon do, and the opponent is drunk, delusional, or clearly unskilled).  If not, I intervene and separate warring parties in hopes of reaching an accord.
Evasive Maneuvers:  If the attack does not cease, it will then be directed toward me because I'm keeping the offending woman from her target.  I'm a pretty big guy, and odds are I can face the brunt of an attack from most women, but additionally I have some small skill in deflection to further minimize damage.
Shields up:  If the attack does not desist, the opponent does not tire, has some amount of combat skill, and attempts to hail (reason with them) are ignored, it is important that I and my mate are protected, and I will attempt to immobilize the attacker.  Odds are, this will end it.
Now here's the big "IF":
On returning fire:  Now, in the admittedly unlikely event that the woman in question has me significantly outmatched in size or talent, I am unable to immobilize her, 
and she persists in her attack, I will have few choices.  If I'm incurring significant damage, and previous attempts to stop her have failed, you'd better believe the Cap'n of this ship ain't losin' navigation or life support, and I'm gonna' fire off an array of photon torpedos at the bitch.
I say this because I am under no delusion that there no women out there who could outmatch me in size, strength or combat skill -- 
there are -- and if one of them should flip their wig, I'm not about to let myself or my friends get hurt because I'd rather hold on at all costs to some antiquated notion of what it is to be a "gentleman".  I'm both gentleman and realist, thank you very much.