IRISHMAFIA wroteAs Steve stated, the OBS would be cancelled is if 1B was the base the umpire had determined would be the award and there was a subsequent play on another runner. (ASA 8.5.B.1.Exceptions.a)
Steve posted after I'd hit reply and was peering through the book to double check. However, this is a specific situation, not the generalization that I was getting from VC's posts that if the runner returns to the original post, he always looses OBS protection.