Article Photos: Oklahoma football notebook: Sooner defense comes alive in the fourth quarter 46/103

Oklahoma State's Clint Chelf (10) carries the ball against Oklahoma's Tony Jefferson (1) in the third quarter 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. OU won, 51-48 in overtime. Photo by Nate Billings , The Oklahoman