It is an outdoor model shoot. Here is another in which he used the Flip-it off camera.
https://secure.flickr.com/photos/efs2008/6229282958/in/pool-399630@N23/ He uses the Mega both on and off his camera. I would avoid working in full sun. If you do need direct flash, the reflector folds out of the way, so you don't have to take anything off your flash.
https://secure.flickr.com/photos/efs2008/6229282958/in/pool-399630@N23/ He uses the Mega both on and off his camera. I would avoid working in full sun. If you do need direct flash, the reflector folds out of the way, so you don't have to take anything off your flash.