I would not hit a man expecting him not to retaliate because I'm a woman. Except for ubertuber. When we were dating, I hit him all the time and he took it like a good boyfriend. (Kidding, of course.)
Regardless of what happened with your friend and his girlfriend, you sound like you're at least a little worried, which means that you should probably have a talk with him about it for the sake of your friendship. And then talk to the girlfriend in case she needs an ally. Ultimately, though, it's up to him to know that hitting his SO is wrong and he probably should have walked away if she hit him first.
If your counsel and concern are not received well, then you can use the tecoyah/Cynthetiq solution and keep your distance because you've done pretty much all you can.
__________________
"I've missed more than 9000 shots in my career. I've lost almost 300 games. Twenty-six times I've been trusted to take the game winning shot and missed. I've failed over and over and over again in my life. And that is why I succeed."
(Michael Jordan)
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