The "Cannot be put out between the bases where the OBS occurred" is actually an exception to the general rule. It is NOT the general rule. The general rule says you protect the runner to the base she would have acheived, in your judgment, had there been no obstruction.
The general rule also says that if the runner attempts to advance beyond this base, she is at risk.
The reason for the exception of "between the bases" is for the situation where your judgment is the runner could not have made the next base, so you are only protecting her back to the previous base. If she is tagged out while attempting the next base, the "advance beyond the base" part would come into play and the runner would be out. Hence, the rule that this cannot happen (barring certain exceptions), so you return the runner to the previous base.
You should not be focusing on this when making your judgment. It should not (according to ASA NUS) be a step-wise judgment whereby you protect her "at least" within the bases and see how things unfold.
According to the ASA NUS, we are to make the judgment right then and there the base the runner would have achieved and stick with that judgment. It is a judgment, not a prophecy.
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Tom
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