In or out of batter's box

[SamNVa]

My interpretation is this: If the batter ( part of B-R) is hit with a legally hit fair ball ( meaning she was in the box when she hit the ball ), then all you have is a foul ball; if the runner (part of B-R) iz hif with a fair batted bll, then she is out. So the distinguishing feature is whether the batter has become a runner and the deciding factor (for me) is whether the batter pivot foot has come off the ground or not. If it has then her weight is moving forward and she is a runner, if it has not,then she is still a batter and all you have is a foul ball.

SamC