IF you rule interference here, then somebody's out. R2 just scored, so it can't be him. By rule, I believe it's the runner closest to home (don't have my book here), which should be R1 (wherever he might be, and it seems you might have reversed R1 and R2). Anyway, if somebody scores before the INT, the run counts and the next closest runner is out to end the inning.
I'm not convinced that you've got INT here, unless it's obvious to everyone that the on-deck guy is trying to interfere. If he's just protecting himself, then play on. I'm not going to award an out for the defense's screw-ups. Benefit of the doubt here goes to the offense.
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Cheers,
mb
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