INTERFERENCE
(a) Offensive interference is an act by the team at bat which interferes with,
obstructs, impedes, hinders or confuses any fielder attempting to make a play.
If the umpire declares the batter, batter-runner, or a runner out for interference,
all other runners shall return to the last base that was in the judgment of the
umpire, legally touched at the time of the interference, unless otherwise
provided by these rules.
I'd say you have interference. R2 is out. R1 goes to 2nd. BR to 1st.