I had this happen to me in Thailand and just walked away after telling the girl that I didn't come there to see her and her friend.
Another thing I did was meeting at a park with a girl and her friend ($0 cost to me), then meeting with her next time without a friend. I didn't sleep with that girl, unfortunately, but that's because my logistics and game were effed up at that time.
I also bought drinks at clubs for the girl I was after and her friend to neutralize the friend as a potential cock-block. It worked for me.
I would say there are no strict rules, so when I find myself in this situation, I decide on a case by case basis. It only happened to me in Thailand and Colombia. I don't think I would put up with something like this in the West.
Another thing I did was meeting at a park with a girl and her friend ($0 cost to me), then meeting with her next time without a friend. I didn't sleep with that girl, unfortunately, but that's because my logistics and game were effed up at that time.
I also bought drinks at clubs for the girl I was after and her friend to neutralize the friend as a potential cock-block. It worked for me.
I would say there are no strict rules, so when I find myself in this situation, I decide on a case by case basis. It only happened to me in Thailand and Colombia. I don't think I would put up with something like this in the West.