What Charles had heard from Primo made him think of any possibilities of who the people were. The mere thought that someone had already plotted something against the imperial household member and to think that he is the future emperor of the empire was a serious crime
Primo wanted to kill those people the moment that he had heard what they were saying, however, he couldn't. As nobles that had visited the imperial household, they were always meant to be respected and adored. Yet, what they have said, in a secluded room, whispers from them had made it possible for Primo to even held back what he wanted to do to them. Instead, he acted as if he had never heard a thing from them while the door was slightly opened
His feet couldn't help but walk toward the right path. He knew that he couldn't just disregard what the nobles had said and make it some form of a joke when they weren't even kidding the moment they say that the crown prince will be killed.