When is a Runner "Between" Bases?

[tommyleo]

Originally Posted by MD Longhorn

The basepaths form a square. At each vertex, there's a 90 degree area bounded by the lines from the square, extended outward - anyone in that area is "on" the base wrt passing.

If I am understanding your explanation here, perhaps the ump did indeed make the correct call because he ruled that Reyes was still "on" third base due to Reyes' position on the field (just beyond and just behind third base -- which would be in that "area" you detailed). So when Lawrie was standing on third base and tagged, Lawrie was correctly ruled out even though Reyes was not in contact with the bag?

Is your interpretation of that specific area ("bounded by the lines from the square, extended outward") detailed in any rule book? Or is it a reasonable interpretation of existing rules to fit this kind of situation?

Thanks.