Sasuke is trapped in a mental genjutsu designed to make him feel isolated, hopeless, and completely dependent on Orochimaru for power.
It shows how Orochimaru feeds on the "misery" and ambition of others to sustain his own ego and immortality. (Dub) 139 : Terror! Orochimaru's Mansion
regarding the curse mark? An analysis of the Sound Four’s role in this episode? Hoe4Sasuke - Fanfiction.net Sasuke is trapped in a mental genjutsu designed
Ultimately, Episode 139 is essential for establishing just how deep into darkness Sasuke has ventured, highlighting the "horror" of his new reality, and emphasizing the immense challenge Naruto faces in trying to redeem him. (Dub) 139 : Terror! Orochimaru's Mansion