Interference???

[Baseball_North]

First, off maybe you meant RUNNER interference.... I don't see how it could have been batter interference.

From the way you describe the play, you made the right call. It seems as if R1 just made a good baseball play by breaking up the double play in a clean, but hard manner.

If the runner went off of the baseline and interfered with 2B, and you thought the double play would have been turned, then both R1 and BR are out.

Same thing if there is malicious contact.

But given the play you outlined, you did the right thing.