It's the same under OBR. R3 would have to return to the last legally touched base, which would be 3rd base. It would be a double play if the interference is intentional. Otherwise we have a dead ball, R1 out, and BR on 1st and R3 on 3rd.
Also, make sure it's actually inteference - unintentional contact to a fielder not in the act of fielding a ball would be obstruction and not interference.
-Jeremiah
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