If you keep following the video - the next pitcher throws one that appears to be a strike, but is ball 4 - as they pan around you can see the 1B umpire in the background scratching the back of his hat like WTF.
The "nick" the strike zone has been my thought all along or the pitcher that perfects the eephus pitch. It'll be like going back to parabola ball that dominates U-10 youth baseball <shrug>.