User blog comment:Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd/Arthur versus Mordred/@comment-4135736-20120514121335/@comment-4135736-20120514152533

Well the reason why I think they should stab each other at the same time (similar to how the Gleeman was killed and Uther was mortally wounded) is because it is the best way to show that Arthur is not weak, or another thing they can show is Arthur defeating Mordred but initially hesitating to kill him, making Mordred stab him and Arthur, angered by Mordred's treachery, uses the last of his strength to stab Mordred in return.