Well, the person said that they were a prisoner of the tower. I wonder what the japanese version had.
Anyway, as prisoner, I think it might be Harle. As I said, the Dragon's know the history as they are close to the Earth. If Harle was the prisoner metaphorically as in she has no will to turn her back against her brothers and sisters and be with Serge, she is a prisoner in this fate and has no way out, so she has her say.