Two Common Bluetails were in the process of mating. They had formed the classic wheel with the male on top and the female below. While I was trying to photograph them, and probably disturbing them, they flew around locked in this shape. They did not rush from plant to plant but the male seemed to choose where he was going to land. The female would sometimes also grasp the plant but at other times not. They stayed in the wheel formation for several minutes while I had them under observation.