You said that "F2, apparently having decided immediately to make the play at 1B, utterly ignored B1 and didn't look for a tag.
If this is the case, then I would NOT call the BR out for avoiding F2. The rule explicitly states that the runner is out for running out of the baseline to avoid a tag, so if no tag was attempted, then, IMO, the batter was justified in running around the fielder to avoid an interference call. If the throw had gone awry, I would have had the BR safe at 1st.
SamC
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