User blog comment:GabriellaCullen/My Prediction On This 'Alternate Ending'/@comment-4054533-20120907101633

Didn't you read the book? Kate is shocking Garrett as he's trying to stop her from killing the Volturi after they executed Irina.

Also, it's probably Alice's vision - they're just purposely making it look like it's not a vision to fool the audience. In the scene where Edward throws Bella so she can kick a Volturi guard, I see dead bodies in the background and SM specifically said that she'd never let them kill off someone in the films who didn't die in the books. (Besides, there's a leaked photo of Edward and Bella killing Aro - WHY would they legitimately kill him off?)