As soon as Vincent hinted that he wanted the Human Automaton Alchemy, Roel was urged to immediately reject the idea. After all, he shouldn't be allowed to provide this information to others.
This is a very important medical secret of the Sacred Garden Peak… Of course, it doesn't mean that no one else knows of this aside from the Peak… After all, there were times when it was used to help some important people in other nations.
In short, he needed to report it and give a convincing reason if he wanted to give the knowledge to Vincent. Furthermore, even if he was given permission, there must be other Manipulators at the Diamond Tier who would facilitate the passing over of the knowledge.
This is a very difficult task for him!
He wanted to apologize and ask for a different request but he knows that he can't really provide other things.
'Should I just give up?' Roel shook his head as he shifted his gaze to the sword.