verbal interference ???

[woolnojg]

Position is simple. If it is in the book , then you can't ignore it because you don't like it.
However, your judgement says the rule may or may not apply to the situation at hand.
Fed says there can be verbal obstruction.Therefore, in your judgement, if you see (hear) it, then you call it.
OBR has no such rule so there is nothing there to call.

You call each game under the rulebook selected for that game. You do not mix & match the rules to your liking.
When you step outside the rulebook, you open the door to liabilty.