I interpreted it as “there’s something pretty serious going on with the leg that I’d love to tell you about, but can’t risk it becoming public knowledge until the season is over, because it could be used against me”.
Seemed a pretty innocuous incident to cause him to be ruled out. Either he wasn’t 100% and the knock just reignited it. Or, as he says, it got him on a screw and maybe triggered a nerve or some pain. If it’s the latter, he probably needs some surgery to address it/remove hardware or adjust screws or something.
Either way, I think his season is done. I don’t think we can carry the risk into any of the other games we may or may not have left. Thankfully Gamble and Mann did very well to cover.