Although Dark Magic was forbidden, there were always going to be those who learned it. In most cases, they were criminals. Since it wasn't a widely researched magic and a forbidden one, when fighting against other mages, they tended to find it a little more difficult.
But just because two people learned Dark Magic didn't mean that there would be a sudden connection, other than the fact that the two of them had become instant criminals. However, seeing these two mages in front of Raze mention the words "Dark Magus," now he had some idea of what their connection was.
'Their connection is the Dark Magic and me... I can't believe it. These people, they really follow me?' Raze was largely confused.
It was strange in itself hearing two people say these words in front of him, without them realizing that he was the one they were talking about, but the whole thing had come as a shock.