"Sasuke's Flow!" (サスケの流れ!, Sasuke no Nagare!) is chapter 389 of the original Naruto manga.
Summary[]
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.