Either late Q3 or early Q4, the B went down and I did not see him the rest of the game.
I got to say the crew did not miss a beat at all - from measurements, to trys to KO where mechanics can be much different going from 7-man to 6.
But I was surprised there was not a OA-type official as we see in college.
Is it safe to SAY NFL does not have a spare guy for situations like this?