At the climax of the battle, both Itachi and Sasuke run out of chakra. However, Sasuke reveals that his actions up until now were only a preparation for his final jutsu.
so he could also use the heat
created by Amaterasu.
وذلك كي يتمكّن من استخدام الحرارة
النّاجمة عن أماتيراسو
per sfruttare il calore creato da Amaterasu.
assim ele também poderia usar o calor 
criado pelo Reino das Chamas Infernais.
чтобы использовать жар от Аматэрасу.