In certain cases, you will have to make your existing moonlight appear to be much larger. This happens often particularly when you are trying to photograph someone in a relatively dark area. Whenever there is a little ambient light and you still want the shot to be a perfect one, you have to use a Five in one reflector.
It is true that the main purpose of a reflector is to reflect the existing light. However, you can use such reflector as a normal bounce surface for the flash you use. If you don’t have a ceiling or similar surface to bounce the hot shoe flash, you can create such surface with a reflector.