Interference by a runner who has scored.

[LakeErieUmp]

Perhaps it's a matter of "players don't know the game's like the old days" because in "the old days" F3 would know to throw even if R3 was in the way, then trust the umpire to make the right call when R3 got drilled (which call the umpire would make). Throwing over or around a runner "in the way" leads to nothing good, including turning an easy interference call into us having to decide what F3 was thinking. Was he trying to avoid an interfering runner...or did his throw just suck?