DG,
Having called a "no stop" balk on a pitcher who subsequently made a pick-off throw rather than delivering a pitch, I am loathe to criticize any umpire's "lateness" on a "no stop" balk call. (That was not a particularly pleasant experience for me, nor one I would recommend to anyone else, despite the "educational" benefits.
)
I was a bit puzzled that the call was solely verbal without any physical indication. The first time I watched the video, I thought the pitcher had already "set" at the beginning of the video; but, when someone suggested a "no stop" balk, I watched more closely and saw the pitcher was very slowly "coming set" at the beginning. Pretty close, but certainly a supportable balk call. I was also puzzled by chuckfan's comment about the difference in the pitcher's motion with no runners because there were still runners on the 2nd pitch in the video, but, whatever.
With regard to the obstruction, with this year's change to the NCAA obstruction rule (which had escaped me when I first replied), I would have to agree that this was NOT obstruction - because the F2 was clearly "in the act of fielding" when he first impeded the runner's progress.
I am a bit troubled by Bob Jenkin's assertion that this wouldn't even be obstruction in a FED game, because it looked to me like the catcher WAS completely "denying access to the base" (and clearly NOT in possession of the ball) when he first impeded the runner's progress.
JM