It's a tough call if you want to get involved in other peoples' problems because you only know what you think you see. You never know the whole situation and what led up to it.
Equally in many foreign cultures it isn't considered as taboo for a man to beat his wife as it is in western cultures. I'm not advocating beating wives by any means, I'm just saying that not everybody sees it the same way we do. Just like a kid in China not having any shoes is considered a tragedy here on TV, but that kid probably doesn't think anything of it because his parents and grandparents never had shoes either.
That said, I usually don't interfere in other peoples' business. At the same time I haven't seen anything quite like that. I think it's probably always a good idea to break up a fight in public. Fights in public are bad news regardless of their reasons and the people are just begging for trouble. They can lead to very bad situations and should be defused quickly much as you did. The guy could have just been pisses off and cooled down on the way home, or maybe he got drunk and drove his car into a tree, or maybe he murdered her already. You'll never know so don't let it bother you, get some rest at night knowing that you did about all you could do with the situation at hand. You could have tried to call the cops, but there's also the chance that the guy could have turned the table on you in the mean time and kicked the living shit out of you and put you in a hospital. What if, what if, what if.....you'll die a disturbed man if you ask that question too much.
And I'm sure he wasn't speaking Indian.....there is no such langauge.
b