(THE CONVERSATION) During the second quarter of Super Bowl LII, the party stopped, if just for a second.Tom Brady found Patriots wide receiver Brandin Cooks downfield with a 23-yard completion. Cooks spun around then got laid out by the Eagles’ Malcolm Jenkins, who was going full speed, leading with his shoulder.Right in the middle of football’s biggest game, there it was: another reminder of the NFL’s concussion crisis. NBC commentators Cris Collinsworth and Al Michaels seemed to struggle with the fact that the play was legal.