User blog comment:Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd/WORST plot hole in the HISTORY of 'Merlin'/@comment-4916403-20121014212601/@comment-4190137-20121015051515

He knew druids had magic, and he also new that Mordred was a druid. And since Arthur remembers who Mordred is, wouldn't he remember what he was?

It's a plot hole.