To be absolutely certain about whether or not it is a passed ball, you would have to see the play. If the catcher had no reasonable opportunity to catch the ball, (highly unlikely if it is a third strike), then it could be ruled a wild pitch, and not an error on the catcher. If, however, the catcher just boots it, and it should have been caught, then it would be a “strikeout” with an error on the catcher. Since the error occurred, it cannot be a fielder’s choice. The runner is safe at first on an error, and the runner is out at home on a failed attempt to steal.