Straddling the foul line

[jicecone]

I personnaly have learned that in either position, start in foul territory. Just like a fielder starts his positioning at a stationary spot, then take one or two small steps towards the batter as the pitcher begins their delivery, in anticipation of a play. You can then read and react at the same time as your body has begun it's initial momentum into the field.

That is just "Bullcrap' about whether you can see a check swing or pickoff by staddling the line. If you put 10 umpires in a room to discuss starting positions and mechanics, you will get 15 opinions about what is right or wrong. Guaranteed

Just like any recommended positioning for officiating, it is a suggested "Starting Point", that with anticipation, it is easier for you to get to a spot that gives you the best view of a play, to have the ability to "Make the Right Call". Some officials get into a spot, sink their shoes into the ground and just turn like that dish on the dinning room table. We called it a "Lazy Suzan", but it fits the situation.

Anticipate , read and react, come to a set position, digest what you have seen and "Make The Call".

Just My Opinion.