Your description of your shooting companion's photos as having, "a nice brightened up background" makes me think perhaps he was shooting with a much slower shutter speed than you were. When using flash, the shutter speed controls how bright, or dark, the background is. if the shutter is firing at say, 1/250 second, backgrounds that are reasonably far behind the range of the flash will be DARK. With the shutter speed set to a slowish speed, like say 1/20 second, MUCH more non-flash light will be allowed into the camera from the areas that are BEHIND where the flash reaches, and so the backgrounds will be LIGHTER.
One of the best ways to ensure a bright-ish backdrop is to shoot flash (when indoors) at slow speeds, like 1/20 second or so.