I agree with ^^^^!
However, it can only be young and quite immature girls who act this way. Since I am 35 (and still hanging here to give people good advice) I have realized that with age girls become more independent, their friends are not that important and they can take responsibility for their own actions. Young girls have some weird instinct of "protecting" each other and are not mature/independent enough to leave eachother alone.
If you can't find a wingman, the right way to go is to always do the group first. A couple of minutes is not enough, you need to become friend(!) with at least 3-5 people in the group (or the entire group if it is smaller), the ones closest to the target. So you need to spend at least 20 minutes with them, maybe more. But not more than an hour, unless you enjoy the conversation.
If you are approaching a 2-set without a wingman, you need to entertain both of them the whole time. You can never isolate any of them from the other. This was how I met my girlfriend btw. I seduced both her and her friend during a night out, and was able to choose which one to sleep with.
