physical risk, knee, shoulder, whatever. those things can be replaced, but whether it comes to your brain, it could be replaced. >> we know more now. chris borland said he started thinking about it last season. he had what he thought was an undiagnosed is it concussion, and he talked to brain experts, about the long-term impact on brains, and he just decided the risk wasn't worth it. >> you know what? he's a smart guy. the information is out there now. he has taken advantage of that information, and he has made an informed decision. when i played, when many of the guys who played prior to five or six years ago, played there was no information out there. >> nothing. >> not at all. so you hear these people, these fans who say, well, you know that's why they pay the big bucks, they knew what they were signing up for when they signed the contract. that's bull.