The inning before Guzman's bad throw, a ground ball was hit to him, he went to second for the force (would have been the third out), and the runner was safe. I actually thought that Vidro didn't get there in time, and otherwise they would have had the force easily. So, Vidro's was in part at fault for not getting there, but Guzman was also in part at fault because he should have recognized the situation and thrown to first. That's the way I saw it, anyway.
So on the play in question (the bad throw), same situation, runner on first, two outs, this time it appeared to me that Guzman had a play at second (Vidro was there), he thought about it, then the mix-up of the previous inning flashed before him, and he decided to pass up the force and just go to first (and in all his turmoil, threw it away).
Did anyone else see it that way? I feel for the guy and I think he's really a head case.
On a positive note, on the game ending double play, I though he played it well, hesitating to avoid the runner.