It was the least expected thing he would have seen. He wanted to bring his father back to his good side, but it didn't work. He just found out... that he has a Padawan too.

His eyes looked once at his father — Darth Vader and his padawan and once at the Emperor. He couldn't imagine such an end, much less one where Palpatine mocked him and tried to turn him to the dark side as he was watching his friends fight outside with their X-Wing's.

"Father, there is still a chance for you."