Na I'd be careful about gettin involved in somebody's public dispute. Now if I see a dude smack a chik I won't run up on him (unless like dude said, I kno her or she's fam etc.) but I'd probly snitch (911)
ESPECIALLY if kids involved. Ain no way I can just walk away from seein a chick get popped upside the head by her dude.
My homeboy was cussin out his shorty in a mall parking lot. A cac approached them with that "hey buddy dont yell at her like that!" shyt... My boy told him

... The cac then put his hand on my boy shoulder and repeated himself...unfortunately for the cac he didn't kno my boy has had boxing training...one punch..KO...broken arm due to fall...
My boy was charged with assault but still...mind ya fukkin business hero

Turns out they were arguin over some dumb shyt and IMO the bytch deserved a nice toungue lashing...my boy was only wrong for doin it in public