Since I don't read lips and neither Smith or Singletary is Mic'd I can only guess what they are saying. Here is my guess. Note AS= Alex Smith, MS=Mike Singletary
MS: What the h*ll happened?
AS: Well I was holding onto the ball because I wasn't sure what to do with it and the guy in white hit me so I projected the ball from my hand.
MS: Why didn't you throw the ball?
AS: How do I do that?
MS: Throw?? It is easy, you are an X and you want to throw to the O.
AS: Aren't the O's the defense?
MS: I'm not sure, I thought O was a receiver.
AS: Well if O is the defense then I have been throwing to them all year, but if O is receiver then I am still not sure how to throw the ball to them.
MS: As the QB aren't you suppose to throw the ball?
AS: By throw do you mean skip it to them?
MS: No, hit them in stride.
MS: And you know that Frank Gore is only 5' 10" right? While he is a beast you can't throw the same pass to Gore that you can to 6' 3" Davis?
AS: Is Gore and Davis an X or O?
MS: What do I look like a head coach??? I am just actor/motivation speaker; I only play a football coach on TV.
AS: Well I am going to play harder and not smarter and just throw the ball into double coverage and hope for the best. What is that corners name on the Raiders? Since he hasn't been challenged that much I am just going to toss it his way and see what happens.
MS: How about we just run the ball up the middle, the run establishes the pass. Or in your case the run established the interception.
AS: Crazy idea, but how about we get Westbrook more involved, he had a great play.
MS: Is he an X or O...
Like I said I don't know for sure but that is just my guess.
On a side note, does anyone else feel really bad for Westbrook? He passed up opportunities with the Rams and Redskins because he wanted to be on a winning team. And he gets stuck on a team that really needs his help; yet we don't use him.