The original post has the runner obstructed returning to (and reaching) 2nd after rounding. Unless your judgement is that she would have reached 3rd w/o OBS, once she retouches 2nd, the OBS is off. If she then takes off for 3rd, she is attempting to advance beyond the base I judged she would have reached w/o OBS.
I'm not sure what the paragraph relating to a rundown in POE #35 has to do with my point, but 8.5.B.3 seems, at least IMO, to be fairly clear.
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