Good question. I wasn't completely sure of the answer, so I pulled out J/R.
According to J/R, this situation is a delayed dead ball as there is no play being made on the runner at the time. The umpire should immediately upon signalling obstruction, determine what base the runner will be protected to. The ball becomes dead if a fielder possesses the ball and actually tags the protected runner (to the base he was protected to).
So it would seem that the BU would call time upon the tag being made if he was protecting the runner home (likely). I would think that the BR would be put back on 1st.
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Well I am certainly wiser than this man. It is only too likely that neither of us has any knowledge to boast of; but he thinks that he knows something which he does not know, whereas I am quite conscious of my ignorance. At any rate it seems that I am wiser than he is to this small extent, that I do not think that I know what I do not know. ~Socrates
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