I think it was answered before, but I think I have seen different answers, so which one is true?
In the game manald ring and nagelring will drop. Then in the same game another ring with unique quality will drop from the monster that can drop only manald, nagel and SoJ.
A) The ring will be SoJ, because manald and nagel are removed form the list of unique rings possible to drop.
B) Manald and Nagel are not removed form the list and when the game decides to drop Nagel or Manald, it will be failed unique, so SoJ will drop with the same low probability as allways.