Dan,
It sounds like your application of look-back is correct. R1 is not subject to the look-back rule until B2 reaches 1B. At that point in time - provided no "play" by F1 who does have the ball and is in the circle - R1 is subject to look-back and must immediately go to 3B or return to 2B with no further stop/feint/...
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Steve M
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