[AlexM]

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Pretty sure the ending will feature a Kensai-Hiro battle.

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Yeah, Hiro kills Kensei via beheading in a sword fight (while Hiro's powers are somehow neutralized or he just like forgets he has them again).

Also, he starts becoming the cooler, darker Hiro gradually over this season as he realizes he's responsible for his father's death and others and is finally there by the time of the duel.