WTF are you talking about? 3rd string had nothing to do with it. He caught it and the UMP called the guy out twice. It was over turned only when A.J got on the base. There was nothing to be done. They got robbed plain and simple.
A catcher shouldn't rely on the ump's call. The play was close, Pierzynski was standing right next to him, why not tag him?
If Molina (either one) is in there this whole thing wouldn't have happened.