Once Naruto and Shikamaru awaken (the later actually faked sleep), Kakashi summons Pakkun to assist them in tracking down Sasuke. Meanwhile, Orochimaru begins his battle with Hiruzen, his mentor before becoming the Third Hokage. Both display powerful techniques in what the observing ANBU describe as a Kage-level battle. During the battle, Orochimaru uses the Reanimation Jutsu to summon Hiruzen's deceased predecessors: the Second Hokage Tobirama Senju who invented the Reanimation Jutsu and the First Hokage Hashirama Senju. The Senju brothers apologize to their former student for what is about to happen as Orochimaru forces them to fight Hiruzen.