Two Questions: Ball hits batter, Overthrow

[CecilOne]

Originally Posted by Jaycec

So for hitting, one foot on the ground and completely out of the box = out of the box.
But for running, one foot on the ground and completely out of the box = not out of the box.

That doesn't seem right. Anyone have a specific rule for me?

Regardless of seeming right, two separate rules, one about illegal batting, the other about baserunning/interference.

"hitting, one foot on the ground and completely out of the box = out of the box" - discrete boundary, observable object, the batter's foot is either there or not

"running, one foot on the ground and completely out of the box = not out of the box" - the entire box is treated as foul territory for batter position only, because the mass of the batter's body being over the foul line or not is nearly impossible to judge when in motion. Yes, the accepted view is if the batter has either foot or other body part touching the box, the batter is in the box.