Anyone know the source for this:
Gillard also reports that the duel will explain how Obi-Wan is able to defeat his protege, even though Anakin has been established as the most powerful Jedi who ever lived. "Obi-Wan taught Anakin and Anakin has gone past him," he notes. "But when you get to that duel, it's emotional. That's where the mistake will be made. And if you know the characters, you know Obi-Wan isn't going to get emotional and he doesn't make mistakes."