Raublut probably tricked Hildebrand into opening the door to the Farthest Hall. I hope he didn't harm him, once he got what he needed from the boy, like he did with his wife.
I also hope that whoever will do the judging in the end, will recognize that the boy was tricked and isn't a traitor and thus deserves mercy. This feels like a repeat of what was discussed about Letizia, except this time Rozemyne might not be in a position to intervene on his behalf, when the time comes.