Scottk: "No, the runner should not be entitled to advance further unless your judgement says the obstruction also affected that runner."
Not quite true; the runner is "harmed" not by the obstruction, but by your calling Dead Ball.
The correct mechanic is (1) signal OBS, (2) call dead ball when the runner is tagged out, (2) immediatley find other runners.
The obstructed runner is positioned where you judge she would have reached had she not been obstucted; The other runners are positioned where they would have been had you not killed the play. General rule of thumb is "half-way" rule; if more than half-way to next base, send them to that base.
That is the normal mechanic; however, in this case I don't think that you can send B-R back home if she wasn't half-way. So if B-R is at 1B, R2, regardless of how far she advanced, has to be at 2B.
BTW - if I had been BU I bet that I would have seen that foot touch 3B (accidental or not) and I'd have called the force out long before obstruction and/or tag would have become an issue.
WMB
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