I would say possibly "BECAUSE of the obstruction", but regardless, CO is assumed to prevent the BR from reaching safely. Therefore the BR gets 1st, forced runners advance; assuming the coach doesn't choose the result. CO should be a delayed dead because otherwise you would not know the result that the option includes. But it becomes dead in this case when the "obstructee" is put out, either by a throw to 1st or the 3rd strike being caught.
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Officiating takes more than OJT.
It's not our jobs to invent rulings to fit our personal idea of what should and should not be.
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