Try as he might, Texas coach Tom Herman cannot wipe Oklahoma's 63-14 win over the Longhorns in 2000 from his memory."I still remember that score," said Herman, a Texas grad assistant at the time. "It's been embedded into my brain."Oklahoma counterpart Lincoln Riley, then in his first year as the Sooners' offensive coordinator in 2015, saw Baker Mayfield get sacked six times in a 24-17 Texas win."A learning experience," Riley calls it now.Herman and Riley each have some idea about the harsh light that can accompany the Saturday Red River Showdown at the Cotton Bowl.The two are now linked.