Lap Dance Cut Short

Had an experience that suprised me and wanted an opinion. Got a lap dance from a cute girl who didn't seem that interested when the club offered a 2-for-1 special. She was very cute and I was having a good time so when she asked if I wanted another dance (normal price) afterwards I said sure. Half way through the dance she got up and said she was on stage next and left the room. Puzzled I left and saw her at the table outside the lap dance area where the bouncers were and she asked for the whole ammount (two full dance prices, the 2-1 I got, plus the second full price). I felt like giving her half the money for the second dance since I only got half a dance. However, both bouncers (both much bigger, younger and looking for a reason to hit someone) were staring at me and I thought better of it. It felt like a setup. At least she only got $40 out of me. $10 isn't worth getting your head thumped and a trip to jail for "starting a fight"