120929 Marietta: Marietta Derby Darlins’ Rachel Sellars (right) and Rachel Von Ins chase after Torpedo Bay Rollergirls’ Brittany Rayner (1.4) during the Bombshell Brawl at the Cobb County Civic Center in Marietta on Saturday, September 29, 2012. Founded in 2011, the Marietta Derby Darlins are one of numerous roller derby organizations around the metro Atlanta area. Jonathan Phillips Special