Oh, you are right. She is the dancer throughout. I just didn't recognize her with the accent and all that makeup. Again, I was just looking for River Tam, so that was my problem. I managed to do a Google image search, Mana. Are you talking about an actual scene of Amy Acker and Alexis Denisof dancing?
Also, my River quote sig needs to come up more often in this topic.
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snowpork
http://img.imgcake.com/Zazipngbu.png