In the end of episode 5x11 "The Drawing of the Dark", Mordred reveals Morgana that Emrys, whom she has been searching for long, lives in Camelot and is, in fact, our hero Merlin.
My question is: how does he know? Some thoughts:
- The only people who know Merlin's identity are Gaius, Alator (who has known that from Gaius) and his disciple Finna (and Kilgharrah, but I don't think it matters here);
- Alator refused to reveal Emrys' identity to Morgana, at the cost of his life;
- Finna, when captured by Morgana (end of 5x10 "The Kindness of Strangers") kills herself before telling anything to Morgana;
Mordred knows that Merlin is a Sorcerer but, as he says while confronting Morgana in 5x09 "With All My Heart",
MORGANA: [...] Where's Emrys?
MORGANA: You pretend you do not know of whom I speak?
MORDRED: It is a name I've only heard of.
So my question is: how can Mordred, in the end of the episode, know Emrys' true name? When did he became aware of that?