Then, Schwartz stopped himself -- perhaps too late.
"If I talk too much, somebody is going to find something wrong with an X-ray," he said.
It appears that's exactly what happened.
"I have no idea," Best said after missing practice because of the concussion.
The Lions' backfield depth took a hit during the preseason when rookie running back Mikel Leshoure suffered a season-ending Achilles injury. The team signed running back James Davis to the practice team, and he might have a chance to be activated and give Detroit a third running back for Sunday's game.
The Associated Press contributed to this report.