The Light and Dark of the Mangekyo Sharingan

The light and dark of the Mangekyo Sharingan opens the brothers' duel in full. Itachi's Tsukuyomi meets Sasuke's hatred-honed resistance; Amaterasu's black flames answer; the Mangekyo's powers clash across the hideout. The episode is the duel's escalation into mythology — two Uchiha wielding the eyes' forbidden techniques, the light and dark of a bloodline's curse made literal. Sasuke's grand counter builds toward Kirin while Itachi reveals the Susanoo. The fight the whole arc promised ignites into the franchise's most loaded duel.