Just to point out that I'm welsh and I've never had a fight in my life !!
And yeah you shouldn't have gotten involved really because all joking aside if you didn't know the girl in question you can't make an accurate guess as to wether she was going to do something like pull a knife on you .
My cousin {whos welsh and also not violent} was in a pub in london talking to his girlfriend and some bloke starting being increadibly rude , My cousin asked him to go away and the guy walked off , grabbed a pint glass , came back and broke it in my cousins face so hard that he fractured his jaw in five places and hes still having surgery to try and cover the scars.