Infield Fly / Interference

[DDJBDPGM]

1 out runners on first and second. Pop up to short. Infield fly declared. R2 plows into F6. Ball drops. R2 advances to third. What's the call?

[Thunderheads]

http://umpire-empire.com/index.php/topic/57746-int-on-an-iff/?hl=%2Binfield+%2Bfly+%2Binterference

[spiffdawg7]

R2 is out for interference and the batter is out on the IFF.  3 outs inning over.  If there had been no outs to start with then R1 would be returned to his TOP base which is 1st.