Nevertheless, I see how the text of that plot card and the application of the Golden Rule could easily lead to a legal interrupt in the hero's attack sequence.
This, however, seems to lead a very counter-intuitive situation where a range attack may now fail for not having enough Range, while a Melee attack couldn't fail because it has no Range requirement (it only has a limitation on the target selection, but at that point the target has already been selected).
Recently FFG representatives stated that they will decide on rule questions on interrupts on a case-to-case basis. There is no general guideline how to deal with it (yet). To clarify it, you need to ask FFG.