There is no "That Line". There are many lines. Umpires through their experience, background, and knowledge and understanding of the game, have their own line. Those who draw it most apporpriately move up and are successful. Those who don't, don't.
It's similar to Louis Armstrong's famous response to the question of "What is jazz?"
"If ya have ta ask, you'll never know."
Draw your line. As you progress you will move it one way and then the other. It'll curve to include somethings but not others. Watch, work, listen and learn and your line will be right where it's supposed to be.
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