The ump was simply signaling "no contact" with his right arm extended and then "strike" with the closed pulled down fist, which was the same "mechanic" (i.e. impire's technique) he used throughout the game whether the third strike was caught or not. Of course, the Angels' catcher didn't even wait for the fist before running off the field and rolling the ball to the mound -- even though he knew that his glove had made contact with the dirt and that the umpire hadn't called "batter's out". That's really stupid and it may have even shocked the umpire into ruling a no-catch!
That means strike out.