We know that Phenidone/Dimezone S catalyzes oxidation of ascorbate,
This is just not true you misunderstand the meaning of catalysis. Ascorbate ion reduces oxidized Phenidone/Dimezone back to the parent compound. However this is a moleculae for molecule process not the massive oxidation of the ascorbate that your statement implies.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.