Article Photos: Oklahoma football notebook: Sooner defense comes alive in the fourth quarter 45/103

Oklahoma State's Clint Chelf (10) runs past Oklahoma's Tony Jefferson (1) 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. Oklahoma won 51-48. Photo by Bryan Terry, The Oklahoman