When Alice arrives, she claims that she has evidence that Renesmee will never be a threat, and offers her hand to Aro to প্রদর্শনী him this. She then pulls away, saying "whatever I প্রদর্শনী you, you'll never change your mind!". The fight breaks out. Several people are killed, including Carlisle, Jasper, Seth, Leah, Jane and all three of Volturi leaders including Aro as the last.
As he dies, it's then revealed that all of this - the entire fight - is a vision of Alice's which is what she's প্রদর্শিত হচ্ছে him. He wants to save himself so he listens to the rest of her evidence (as in Nahuel) and the Volturi walk away as happens in the book.