The patriarch had his eyes closed. He was thinking of something and using his divine sense to perceive the world around him.
Now that Arthur's test was over, he had no mood to watch any other child's performance. Instead, he wanted to see what would happen when the proud children of the family knew exactly who it was they had mocked as soon as they met him.
Despite being in a sealed room within the ship, he could see and hear everything happening on the ship. And while he understands that it is unlikely for a true child of the family to apologize to a bastard, he is still hoping that one of those children will be smart enough to know that their identity will soon mean nothing if they get into a sect with Arthur.