Dorrien saw her do it.

            In fact, he had seen her the very moment she lifted Hans Ryder from the ground with just one hand. He does not question that because Romaine is a vampire in the first place. 

But the fact that Romaine wasn’t wise enough to take a peek at Han’s mind if he was really the real one or just a duplicate of the real Hans Ryder is a dumb move...and an advantage for Dorrien.

            Dorrien can’t still get over the fact that Romaine is a double agent. He doesn’t know why or how or since when. Yet, she prompted him to play this game of secrets...