Let's start with the basics. With slightly fewer than 10 minutes left in the first quarter Sunday, the Vikings defense wasn't trying anything fancy. Cornerbacks Asher Allen and Benny Sapp were both in press coverage on Lions receivers Nate Burleson and Calvin Johnson, respectively.
Cedric Griffin apparently didn't get the memo. Standing upright and giving Titus Young an 8-yard cushion, Griffin suffered a momentary mental lapse.
Then his failure to re-route Young as he darted undeterred up the left sideline proved even worse.
Lions quarterback Matthew Stafford saw everything he needed. First freezing Vikings safety Jamarca Sanford with a pump fake to Johnson down the middle, Stafford then launched an easy 57-yard touchdown bomb to a wide-open Young.
Basic play call. Basic breakdown.
Griffin's absence seemed baffling. It irritated coach Leslie Frazier enough that he put the veteran cornerback on the bench for the rest of the 34-28 loss.
On Monday, Frazier still had no answers for why Griffin didn't handle his responsibilities.
"It's hard for me to explain that one," Frazier said. "He's executed that technique time and time again in his career here. So to not get it done on that play, I'm not certain why that didn't happen."