Dancing in the dark

I had a chance to shoot with a very talented dancer, and I wanted to use only a single light. We tried couple of setups, and at the end I used an 80 inch octobox, I placed almost right above her head and I bended it down towards me a bit. Also from the beginning I knew that I want if in B/W. I used a Nikon d800 and a Nikon 105 2.0 DC lens.