[AtlUmpSteve]

Case plays in both NFHS and ASA make it clear that an IFF can (and should) be called retroactively after a play if it is apparent one should have been called during the play. This isn't used to challenge the judgment of "normal effort", but to correct an error in rule application (didn't realize the rule was in effect).

With that as a standard, I would say that the IFF should/could be called in this case, too, whenever it is determined one should have been called (and until a succeeding pitch is thrown), be it before or after the actual interference. In the same vein, the time of announcing the interference or killing the play isn't a deciding factor; all awards and penalties are applied as of the time of the interference. If it was an IFF at that point, whether declared or not, it is an IFF.