We were told at an ASA umpire school that if the runner is OBS between 2nd and 3rd they are protected only between 2nd and 3rd. If they try a base beyond and are put out you have to judge if they would have made the base if not OBSed. If they stop in this case at 3rd, you can not award home. I have been working the plate, had a runner OBS between 2nd and 3rd. Bang-bang play at the plate, runner was tagged out. I awarded home on the OBS. Had she stopped at 3rd I would not have given her home because I didn't know if she would have made it or not. I am just trying to reason this out because I have been told something different that what you are saying.