‘Sunday will mark the second regular-season faceoff between Rivera and McDermott — a battle of mentor versus mentee — but this time, the circumstances are much different. For one, Rivera is no longer at Carolina, with the coach now trying to build Washington (1-1) into a contender. And McDermott has transformed the Bills (1-1) into one of the league’s best teams, a juggernaut that Rivera said would be a “measuring stick” for his squad.’