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If you're going to delve so deeply into the matter, please provide an interview with the developers of Heroes of Might and Magic III, where they clearly explain what in the game is a bug and what was intentionally designed.
Where is the 100% guarantee that the feature with the Special Abilities (SA) was not initially conceived by the developers, given that it is extremely rare? There is no such guarantee. We are already adding our own interpretations, supposedly based on common sense.