These guys are card scammers. The play is the girl will ask you to pay for her using your card and she'll give you $20 cash. The fake driver will switch out your card and hand you the pin pad with someone else's card. You enter in your pin, it'll approve it automatically, and now everyone goes their merry way none the wiser. Happened to me back in December, I luckily realized it in a few minutes and had by bank freeze the card. This was a few minutes ago in the Winners plaza in Heartland.
I didn't give her a chance to tell the whole story, recognized the scam right away. The good thing was as soon as I told the winner's security lady, she was all over this. Compared to the heartland Walmart where these hooligans had actually managed to take my card back in December (luckily no money was stolen as I froze the card as soon as I realized it had been switched), the Walmart manager told me they can't get involved not help with any video recordings in any way.