"A Duel with Destiny, Part 2", known as "One Strike That Changes the Future" in the Japanese version, is the ninety-fourth episode of the Yu-Gi-Oh! anime. It first aired in Japan on February 12, 2002 and in the United States on October 18, 2003.
Although Kaiba fights well against Ishizu, she still is unfazed by him thanks to her Millennium Item. When Ishizu has him cornered and nearly out decked, it seems that her vision will come true and that Kaiba will be defeated. Suddenly Kaiba receives a vision of his own from the Millennium Rod that might save him from Ishizu.
In this Duel's final turn, the timing of activation for Kaiba's "Soul Exchange" is unclear to determine: is it at the end of Ishizu's turn or during his own turn? It is however very likely that "Soul Exchange" is played as a Quick-Play Spell Card at the end of Ishizu's turn, otherwise Ishizu would have been free to attack Kaiba directly with her 3 monsters and win the duel, and also due to the fact that Kaiba Normal Summoned "Blue-Eyes White Dragon". In this case however, the anime bends the rules a little because "Soul Exchange" is supposed to be a Normal Spell Card.
Even after Kaiba used "Soul Exchange" to summon "Obelisk the Tormentor", it's seen again when Kaiba is considering using the "Blue-Eyes White Dragon" instead.
Similarly, due to the particular way in which "Sacrifice Blast" (a.k.a. "Blast Held by a Tribute") works in the anime, it is shown to activate immediately after Kaiba takes control of Ishizu's monsters. In a subsequent scene displaying the Arena (after Kaiba summons his "Blue-Eyes White Dragon") both Duelists are shown to have no cards face-down on the field. This confirms that Ishizu's card has already been "activated", unbeknownst to Kaiba. This also significantly bends the real-game rules, since "Sacrifice Blast" would have to remain on the field until it is activated (presumably, at the moment "Obelisk the Tormentor" attacks). This requirement is however skipped for dramatic effect.
In the dub, when Mokuba is translating the text, a Lifepoint noise is heard before he heads out to check on Kaiba's duel.
Featured Duel: Seto Kaiba vs. Ishizu Ishtar, Part 2
Tuen 13: Kaiba
Kaiba draws "Magic Removal Virus Cannon" and subsequently activates it, but Ishizu activates her face-down "Muko" to negate the effect of "Magic Removal Virus Cannon" and destroy it.
Turn 14: Ishizu
Ishizu draws "Zolga" and subsequently Normal Summons it (1700/1200) in Attack Position. "Zolga" attacks and destroys "Dark Gremlin" (Kaiba 2950 → 2850). "Kelbek" then attacks directly (Kaiba 2850 → 1350). Ishizu Sets a card.
Turn 15: Kaiba
Kaiba's hand contains "The Flute of Summoning Dragon", "Silent Doom", "Blue-Eyes White Dragon", "Cross Sacrifice", "Ring of Destruction", and "Obelisk the Tormentor". Kaiba draws "Crush Card"[Notes 1], but Ishizu activates her face-down "Muko" to send the drawn card to the Graveyard. Kaiba Sets a card ("Cross Sacrifice"). Kaiba intends to activate his set card once Ishizu gets three monsters out onto her field.
Turn 16: Ishizu
Ishizu draws. She then Sets a card ("Sacrifice Blast"). In the anime, Ishizu reveals (to the viewers, thinking to herself) that this Trap has already begun infusing its power into one of Ishizu's monsters ("Zolga"), so that when Kaiba uses "Cross Sacrifice" to seize its control and tribute it, it will be transferred to the Tribute Summoned monster i.e. Kaiba's "Obelisk the Tormentor". Once Seto attacks Ishizu directly with "Obelisk", the effect of "Sacrifice Blast" will activate, defeating Kaiba. Ishizu Normal Summons "Agido" (1500/1300) in Attack Position. Kaiba activates his face-down "Cross Sacrifice" to Tribute "Zolga", "Kelbek", and "Agido" and Tribute Summon "Obelisk the Tormentor" (4000/4000) in Attack Position.