i have no idea whether this has been discussed before, but I love discussing this locally trying to find an answer.
A player in the field, he straddles the foul line behind a runner that is on 3rd base.
Would this be a balk, since he is not in fair territory?
Now, you may say that one foot in and one foot out is considered in fair territory.
I say if you have a runner running down this same line, he straddles the line. If the ball hits him in FAIR TERRITORY, he is out. If it hits him in FOUL TERRITORY, he is safe. The key word "Foul".
I hope this opens a lot of discussion and theories. Because "I think" it truly is interpretation of the RULE.
Michael