I chalk that Panthers game up to:
Frigid weather, concrete-like turf, and the Lions just froze up due to these conditions.
Which I hope was a learning event for the team, and I'm certain Campbell harped on it that week.
The team is going to face adverse situations - weather, officiating, other - and they are going to have to fight through any of that in order to get to the top. I think they folded in Carolina and they can't do that if they wanna win. Especially once they're in the playoffs.