From a story on theathletic.com by Sam Blum headlined “Why MLB umpires hope the art of the signature punch out wom’t be lost”:

Whenever Dale Scott went to work there were eyeballs zoning in on his every move, and metrics to rate each decision by the millimeter. That’s the nature of being a Major League ump. Scrutiny follows you in everything you do.

There was, however, no one watching his work in this moment — something for which he was thankful. He was about to do something that he says every umpire does, though not all would admit to it: practice his strike three call in front of a mirror.