Art trade Merlin

A magical duel. Non-canon scene. My half of art trade with awesome maryluis   

What's going on? And who is this unnamed sorcerer in the foreground?
We don't know.
Who will win this duel?
I think I have an idea ))

Imagination on "How Arthur learned that Merlin the sorcerer"(c).
Merlin protects Arthur and his army in the middle of a hard battle. But no one, of course, did not expect something like THIS.
Epic  
At the beginning the idea sounded like "Merlin's transformation into a dragon"(c), but over time art has turned into.. this.
I hope you'll like it