yeah, dude most of the time a wingman is extremely useful in helping to entertain other non targets in your set. it's a pretty difficult thing to do by yourself, entertaining 4 girls at once but it can be done.
On the other hand, i don't think in this scenario it would've been totally necessary to isolate the target. I mean, you probably could've number closed right there by saying 'i gotta go, let me get your number' or otherwise making up some good reason to get her number.
almost always the friends have no problem with their friend SPAM a number. Hell, one time I opened a three set that was sitting down at a rave (in the lobbyish part) and I stood one of them up and made out with her right in front of her two friends. Depends on the girl, but I'd say a lot of times isolating isn't even necessary unless you're gonna f-close.
hope this helps
