Vincent presents himself as a poised man, always smiling and likes to say "Yup" in the end of nearly all of his sentences.
When Benjamin orders his fourteen soldiers to not only act as bodyguards, but spies to the other Princes, he wanted them report back any information on the Princes Nen Beasts and the Hunters abilities. And in case they come under attack or suspect any animosity coming from anyone, they have the right to defend themselves and have full permission to kill their opponent. Later Vincent visits 倭舞琉's quarters and upon entering the room, he kills one of the stewards claiming she tried to attack him with a knife and had a small vial of poison on her person. In his defense Vincent claims he was merely exercised his right to defend himself.