Care to explain?? Blu is having a FL50 and a E-330.
lets say u r indoors and shooting portraits. u can raise the onboard flash of ur E330 and aim ur Fl36 up at lets say 45 degree to bounce the light using ceiling. The onboard flash in this case can be used as a catch light or fill light to create the sparkle in the subjects eyes and the bounce light to make the picture more natural.
Fl50 does not support this. only Fl36 does now.