I'm wondering if I'm using the D7000's Commander mode incorrectly. Page 225 of the Nikon D7000 manual says
The built-in flash does not fire [in "--" Option], although remote flash units do.
Yet what I've found is that the built-in flash in fact does fire, adding ugly on-camera, direct flash to my photos especially for short-distance subjects. I present Exhibit A below, where it is seen that both the remote SB900's and the on-camera's flash are captured, even in "--" Commander option. How do I fix this?