Article Photos: Oklahoma football notebook: Sooner defense comes alive in the fourth quarter 68/103

Oklahoma State's Clint Chelf (10) os sacked by Oklahoma's Aaron Colvin (14) during the Bedlam college football game between the University of Oklahoma Sooners (OU) and the Oklahoma State University Cowboys (OSU) at Gaylord Family-Oklahoma Memorial Stadium in Norman, Okla., Saturday, Nov. 24, 2012. Photo by, Sarah Phipps The Oklahoman