Itachi has always been a prodigy, but since he was an Uchiha, he excelled in Fire Style Jutsu. When he was a kid, his Fireball Jutsu was comparable to those of the strongest Uchiha adults at the time.

Last week's flashback focused on Sasuke's relationship with Itachi and the hardships of trying to live up to Itachi. This week's flashback focuses more on Sasuke's relationship with his father.