ON SATURDAY, Houston Texans running back Tyler Ervin left in the second quarter of a 34-16 loss to the New England Patriots after suffering what was later diagnosed as a concussion. Earlier, in Seattle's 36-20 loss to Atlanta, Seahawks tight end Brandon Williams suffered one and Luke Wilson was evaluated for one too.
Once in every NFL game it seems a player is checked for a concussion. Some leave. Some return. No one knows what other players, if any, might have suffered undiagnosed ones, each blow to any part of the body, especially the unexpected ones, unavoidably jarring the brain from its stem connecting to every significant human function.