I had already seen that video. Note the reaction of the first base umpire (the one that you can see at the beginning of the video). As soon as the ball hit the plate ump, he started toward the mound. The third base coach immediately started toward the third base ump and said something. They both obviously thought that it was intentional. The coach of the team that threw the pitch tried to say that it was just a mix-up between the pitcher and catcher, that the catcher was looking for a curve and the pitcher threw a fastball. I don't buy that. If the catcher is good enough to be catching for a team in the state finals, he should have been able to react in a manner to at least try to get a mitt on the ball. He didn't. He never moved toward the ball. It is obvious that he "ducked" the pitch.
Finally, note the reaction of the fans in the background. They were apparently the fans for the team on defense. At least they were wearing their colors. They were cheering after the play. What great sportsmen they have at that school.