Batter-Runner Interference after play at Home

[BJ Moose]

This is an "on field" guess.. but even with a DEAD BALL at the time of INT... R3 had scored well prior to the event. I keep the run, but would return R1 if he had not reached 2nd base.

This play is more interesting with 2 outs. Then, of course, we are taking the run off the board.