User blog comment:Edrea/Everyone Turned Blind-Eye to Merlin's Power/@comment-5674726-20130715000327

She didn't actually see Merlin use magic but shame on Morgana for hearing Goblin!Gaius reveal that Merlin was a sorcerer, with a magic book as proof, and then taking his retraction at face value rather than putting two and two together about how Arthur's allegedly useless servant was able to thwart her plans, not to mention escape from Morgause's enchanted chains.