The Sorcerer Hangs at Dawn

Arthur doesn't know what to think when they drag him in. It's his friend, his Merlin, but a man from the town has told his father that he's a evil sorcerer of some kind. And Arthur knows sorcerer's are evil. All of them... right? So if he's a sorcerer, why is Merlin, sweet, dependable Merlin... so... good? Can Arthur make his mind up on magic in time to save him from the gallows?