Interference

[fwump]

Very interesting question. I was ready to rule interference on BR until I read the referenced situation in the J/R, which is exactly the same sitch. I think "untouched" is the operative word here. If the ball was touched by F1, and there was contact, you have nothing but a foul ball. Since there was no unfair advantage gained by the BR in this situation you also have nothing.
IMO you could rightly call OI if the ball subsequently rolls fair after F1 was unable to field the ball due to contact by BR.

Mike