Oh - what an evil cliffhanger! :( Love how Merlin is able to shapeshift - very cool. And I like how you included bits of past conversations with Cain.

I'm looking forward to seeing how Arthur reacts to the Cain situation - if/when he finds out what the real deal is.

But Cain definitely has something to hold over Merlin (knowing he's magic), which is definitely not a good thing.