Let me see if I can address any confusion, which it appears may have started with my initial response to Bruce's post No 8
I read post No 8 as a method Bruce had seen where a flash was placed on the camera pointing backwards (180 deg to sensor/lens/subject axis) at a reflector behind the camera to illuminate the subject. This confirmed as the setup in post 19. My initial thoughts were that it appears against all I have read and will produce flat lighting on the face.
I could not think of a reason to do this other than it's simple IF you have no way of triggering (by cable/optical/radio) a single 'off camera' flash placed anywhere else. My reference to the 45/45 position of the reflector with the flash still on the camera aimed at it was a possible other scenario for improved lighting of the subject although as mentioned, less difficult if camera/reflector/subject remain in the same positions.
I would be interested to see the video as it may explain/show 'advantages' or 'reasons' for the method used.