BOULDER — The pass bounced to the grass, and Will Sheppard threw up his hands in disbelief. Then Folsom Field let the boos rip. CU did not get a pass interference flag on its last offensive play in a 31-28 defeat to Kansas State, a call which would’ve extended the Buffs’ final drive and perhaps led to another dramatic Big 12 win in Boulder. “It looked like it was pass interference to me,” CU head coach Deion Sanders said.