Ref tries to explain the blatant facemask no-call on Rams safety vs Vikings Yahoo SportsRef: Couldn't see apparent face mask on Darnold ESPNVikings-Rams facemask controversy: NFL official explains why refs did not penalize L.A. for end-zone face mask CBS SportsRefs say they couldn’t see face-mask penalty late in Vikings-Rams game - The Athletic The New York TimesDarnold, O’Connell not blaming missed face mask call as reason why Vikings lost to Rams The Associated Press