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My suggestion that it's actually a foreshadow that tells of the Uchiha bro's victory against Kabuto. The great Orochimaru has been beaten, but a snake has slithered its way out of its doom to continue his adventure (this being Kabuto). It's all in vein however, as the Uchiha (in the form of Amaterasu) defeat it in the end. Maybe it also foreshadows Itachi's death, as he also dies during this chapter. Thoughts?