"Sasuke's Flow!" (サスケの流れ!, Sasuke no Nagare!) is chapter 389 of the original Naruto manga.
Sasuke attacks Itachi before he has the chance to use Amaterasu. Itachi dodges Sasuke's fūma shuriken, only to find that he has fallen in to a trap; the shuriken detonate and Itachi, injured and eyes failing, is forced to fall back. The two brothers exchange Fire Release: Great Fireball Techniques. When Sasuke's begin to overpower Itachi's, Itachi is forced to use Amaterasu.