Bart Scott said this morning on First Take, that the players all do a baseline concussion test prior to the season. He said he made sure he did poorly on the baseline test so that he could easily pass it if he had to take it to rule out concussion. So the protocols can be manipulated. The players who watched the game all knew Tua was likely concussed last week. As Bart said, you don't shake your head getting up from a back injury.