running lane violation

[Rachel]

I have a question about ASA 8-2-E. The rule states that "in the judgement of the umpire, the runner interferes with the taking of the throw at 1st base". I have not called this if the throw doesn't hit the runner. What, if by the runner being there the throw is off line? Or, the catcher after fielding a bunt tries to throw it over the runner and it ends up in right field. Do we just tell our fielders to throw it at the runner to get the call? What kind of cues do you use to make the determination of interference?