Depending on which series you are following, Episode 143 tells a very different story:

: Yuya Sakaki must duel his best friend, Gong Strong , to regain his will to fight and find a way to make the world smile again after the devastating war of the dimensions. Yu-Gi-Oh! - Episode 143

: Leo finally awakens as the Sixth Signer . In a desperate battle against Aporia, he evolves his Power Tool Dragon into the legendary Life Stream Dragon , saving Jack and Luna from total despair.

High above the waves, didn't look back. In his mind, destroying the tower was the only way to bury the memory of his defeat and move toward a future he could control. He veered his Blue-Eyes White Dragon jet away from the group, disappearing into the clouds without a word.