One reason used to justify the knights taking Thorfinn on their journey was that only he knew the directions to the castle, which was a major plot point since all the other knights needed Thorfinn's knowledge of the terrain to get there. However, as it's eventually revealed later on, Hal was King Vortigern's son all along. So in all that time, Hal didn't even know his own way home? Because the castle he allegedly needed Thorfinn's help to locate should presumably have been his own home where he grew up in. Was he exiled for so long that he forgot where it was or did he just hit his head at some point and lose all sense of direction back to his old home?
