Fein became silent when he heard Gregory's words. Did he want to announce his S rank status? Well, he knew that if he did announce that he was an S-rank degu user. He would gain a lot from it in terms of status and power. A long thing would also become convenient at that time. Of course, if there are pros, then there are also cons. There's a proverb that says that 'A tree that is taller than the forest will be blown over by the wind.'
Though he had enough power to protect himself now as long as he doesn't face a perverted SS rank creature. What's more, ranks higher than S rank should belong to the category of endangered species by virtue of the fact that promotion of S rank was a hundred times more difficult than ascending from A rank to S rank.