Here is an example of what you can do with a very basic bounce flash. I placed a reflector over Scarlett's head and fired my SB900 at it.
I was able to let more shadows in around Scarlett by using a fast shutter speed of 1/3200.
In order to get that shutter speed I used a Nikon SU800 as the flash commander which allows you to get as fast as 1/8000 of a second with CLS capable flash units.
See no Scarlett
Camera - Nikon D300
Lens - Sigma 28-70mm f/2.8
Exposure - 1/3200 @ f/2.8
Focal Length - 70mm
Lighting - Nikon SB900
Light Modifier(s) - White reflector and bounce card
Trigger - Nikon Nikon SU800