User blog comment:Harian96/The Smile of Mordred/@comment-24629321-20140323233853

I actually didn't remember that Mordred smiles until you mentioned it, and I took another look at that scene. It is a bit cryptic! It could just be that he doesn't mind dying because he has achieved his vengeance against Arthur (for executing Kara), and in dying he'll be with Kara again. Or, more interestingly, perhaps he didn't really want to kill Arthur (but felt duty-bound to avenge Kara), and it was a bit of a relief for him to not have to go on living as a killer—especially having killed a man whom he truly had cared about not long ago. Those are just my interpretations; I'm sure there are many others...