I've run many 2-sets before where there was a shy girl and a very outgoing girl. Whenever I'd have the shy girl as my target, I'd almost always end up making out with the outgoing girl. It's kinda weird.
I usually don't try to switch back to gaming my original target because I realize that I like the outgoing girl better, even though I
think I'm drawn to shy girls. I guess attraction isn't a choice.
Outgoing girls are just more fun! They stimulate me.
Perhaps I'm just not so drawn to shy girls as much because they don't dance as well. I do a lot of dance floor game. I guess this post doesn't help you at all since the outgoing "obstacle" is almost always more "my style" haha. Sorry.
...I LOVE to take shy girls out on dates one-on-one, though. It usually takes me 2 dates to full-close these types of girls, though. Time bridge and day 2 those shy girls and you've got it made, man.