Although Vincent was in the academy, he had a rough guess of what was happening beyond the walls of this place. He knew about the task his sister had been going through since the shadow Neirin gave him was useful.
According to this "Shadow," he was one of the guild masters of the court of miracles. Although the other guild master was under his sister, this particular one was under him. Perhaps Neirin thought that he would grow suspicious overtime after he wasn't able to have any information outside.
Hence this gift: a person he was able to utilize to gather information for him.
It was a calculative and praiseworthy move if someone asked Vincent. He looked at the windows and the view outside. He fell silent for a moment, thinking.