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Kaiba confronts Yugi waited outside the castle , blocking Dark Yugi and his friends from entering. He claimed to have known that Dark Yugi would defeat any opponents he faced on the island and imposes identified himself as the only person in the world who could defeat him. While Honda and Bakura restrained Jonouchi from attacking Kaiba, Kaiba noticed that Jonouchi had earned ten Star Chips and said that he promoted him from a Duel"loser" to a "deadbeat" (In the Japanese version, he promotes him to an ''uma no hone'', which literally means "horse bone"). Thinking of Yugi's friends try success in Death-T, Kaiba wondered if people can be stronger by carrying the weight of protecting someone. With saving Mokuba in mind, he though he would find the answer by winning a Duel. He challenged Dark Yugi to a Duel, leading Jonouchi to advise him against acceptingsuspect he was working for Pegasus, as which Kaiba considered an insult. Despite his friends objecting that he already has had enough Star Chips, but he switches to Dark Yugi and acceptsaccepted. <ref name="d d 41">{{chapter|Yu-Gi-Oh! Duelist|41|ref}}</ref> Kaiba uses the Duel as an opportunity to test his strategy to combat Pegasus' mind reading abilities. Since he was using [[Duel Disk]]s, he was able to stand further apart from his opponent and avoid face-to-face contact. Kaiba Summons "[[Blue-Eyes Ultimate Dragon]]", causing problems for Yugi, but Yugi fuses it with "[[Mammoth Graveyard]]", causing it to decay and lose [[ATK]] each turn. In the meantime, Kaiba is unable to draw new cards, as the Fusion, composed of "[[Polymerization]]" and the three "Blue-Eyes White Dragon" cards, is taking up four slots in his Duel Disk, while "[[Negate Attack]]" is occupying the fifth, without a chance for Kaiba to use it. As Yugi is about to win, Kaiba begins to suffer a gruesome hallucination where Mokuba was trapped inside the rotting body of the Ultimate Dragon, being smothered and begging for help; as Kaiba himself stood there staring helplessly in horror and despair, a younger Seto rushed to save him, only to fail and give the older Seto, who began rotting away as well, a glare of immense hatred. Kaiba, awakening from his nightmare, decides to bring out his ultimate weapon: he walks back five stones, each representing one hundred of the five hundred Life points he'd just lost to Yugi's last attack, which leaves him standing up on the edge of the castle. Fearless and confident, Kaiba declares that he has nothing more to lose and that he would "gladly die for the cards", and threatens that if Yugi wins the game with one more attack, he will jump to his death, greatly horrifying Yugi and his friends. He then shows his contempt for Yugi by stating that if their positions were reversed, he (Kaiba) would kill Yugi without a second's hesitation, heavily disgusting and infuriating Dark Yugi. Seeing Dark Yugi hesitant in making this choice, Kaiba dared him to "slit my throat with your card". Although Dark Yugi tries to attack, Yugi takes over and calls it off. Kaiba wins on the next turn, taking 5 of Yugi's Star Chips. Seeing Kaiba would much rather die than accept Yugi's friendship and forgiveness, Jonouchi and Anzu furiously express their utter disgust and renewed hatred for Kaiba, Yugi fears his other self and resents Kaiba, and Dark Yugi would later bitterly comment that he and Kaiba will forever be enemies. Kaiba, sickened by their friendship, simply strode off to the front gates with his prize.