Question 1: Did the scored runner impede/hinder a fielder making a play on the ball.
If Yes (as in the case of the OP, F2 was about to field, or as I said, it could be a fielder backing up the play in the case of an errant throw), then...
Question 2: Did that fielder have a play on another runner.
If Yes (as in the case of the OP, B/R was advancing to 2nd), then...
Enforce Interference.
It's all in the rules - you can't ignore it just cause you don't like it or think it shouldn't be that way. The relevant rules were already outlined in this thread, so I won't badger anymore.
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