I have used this technique before to varying success. But then I probably block a little more of an umbrella than does Andrew. Still worth a try if you have nice background to work with, as in his example.
-30-
"... Who ever thought lighting four football players dramatically would be hard? Getting them all evenly lit is tough, and all I have to say is gaffers tape is smarter than a 22-year-old.
I struggled to hide light stands in the background before I just taped an SB to the wall to get a desired effect. I also must thank my buddy, assistant and the one who will replace my shoes, Kris. I think I showed him how bossy I can be when low on sleep and stressed out. Hopefully he learned a think or two from my mistakes. ..."