The Result of the Betrayal
Kabuto creates a fake corpse that resembles Sai, containing hidden traps to slow down Yamato's clone after sensing it. Naruto hasn't completely recovered from using the Demon Fox's chakra, and Yamato says that he will be left behind if he cannot keep up. Naruto is determined to finish his mission and not slow the team down. However Team Kakashi is forced to take a break when it's clear that Sakura has not fully recovered from her own injuries. Yamato then uses this opportunity to talk to Naruto alone and reveals to him that the one who hurt Sakura was Naruto himself. Naruto is shocked by what Yamato says to him.
Aired 31/01/2008EP 45 - The Result of the Betrayal
Naruto: Shippuden
Naruto: Shippuuden is the continuation of the original animated TV series Naruto. The story revolves around an older and slightly more matured Uzumaki Naruto and his quest to save his friend Uchiha Sasuke from the grips of the snake-like Shinobi, Orochimaru. After 2 and a half years Naruto finally returns to his village of Konoha, and sets about putting his ambitions to work, though it will not be easy, as he has amassed a few (more dangerous) enemies, in the likes of the shinobi organization; Akatsuki.
(Source: Anime News Network)