SatBK - Spoilers
Apparently someone in the animation dept didn't do their job correct and think they got away with it.
Yes, in the not really a big spoiler, the Black Knight aka King Arthur turned-evil is an illusion.
It was an illusion SHE (points to girl above) who created the Black Knight/King Arthur illusion.
Also....the Sonic World Adventure Manga is officially over in the Nintendo Dengeki DS magazine so this month and forth Nintendo Dengeki DS will be showing Sonic and the Black Knight. - w -; I swear the mangaka is making the gag comic for the Sonic manga is making Sonic himself stupid.