As Kusaka raised his hands he got attacked and raised his sword as well in order to block Hitsugaya's attack.
Leaping towards him, Hitsugaya attacks him, forcing Kusaka to block. When Kusaka slashed and forced Hitsugaya back, the other Shinigami express surprise as Rangiku runs towards him.
Hitsugaya: "Matsumoto stay back, this is my fight."
Mayuri watching all this started to wonder why Hitsugaya deserted his post if he did not intend to betray to Gotei 13.
Soi Fon wonders why he attacked them when they tried to arrest Kusaka, who she then asks Sora about it...
Sora: "Then is killing him once by the rules not enough for him.??"
Sora: "Hitsugaya is just trying to make amends for the mistakes which he has made."
Soi Fon: "What mistakes are you talking about??"
Sora then explained to them that Kusaka was once a nobleman who swore his loyalty to Soul Society, he stated he would have been a great Shinigami if it were not for the twin Zanpakutō, but because of his duel with Hitsugaya, he lost not only Hyōrinmaru but his honour and his life.
Confirming this, Sora says Hitsugaya blamed himself for everything which has happened, and Senna stated Hitsugaya could not bear the thought of destroying him again with the rules of being a Shinigami captain.
Rangiku: "Seeing Kusaka again must have been devastating, and he was so racked with guilt, he deserted his post and went after him in an attempt to settle things, knowing he would be accused of treason and it could cost him his life."
As Hitsugaya and Kusaka cross blades, Kusaka says Hitsugaya knew all along it would come to this, which Hitsugaya confirms. Stating he thought Hitsugaya was more intelligent than this, Kusaka says he was wrong.
Hitsugaya: "No you are right, i should have been more intelligent. Because when i saw you i thought of truly deserting my seat and settle things with you."
Kusaka: "Oh?? Then what changed??"
Hitsugaya: "Someone pointed our dream, in reality, now is no different than before, i take pride at my position, however, i don't want to use you as i stepping stone per the rules."
Hitsugaya: "I want to prove myself is worthy of both the sword and the Seat. And not killing you back then as your best friend is my greatest regret that deems me unworthy."
Sora: "Heh, Old man you should know the rest."
Yamamoto: "You would have easily solved this why drag this to this point."
Sora: "Because then you would have to elect a new 10th Division from scratch..."
Yamamoto: "You really have your way to work someone to an old bone."
Sora: "That's why i'm calling you an old man..."
Kusaka took this chance as they were talking and tossed the Oin in the air before cutting it in half with his sword stunning all of them, doing so it created a column of yellow energy which extends into the sky.
As Hitsugaya calls out to Kusaka, Sora appears before him and says there is no need for him to worry about anything else except fighting Kusaka.
Hitsugaya: "Thanks I owe you!!"
As the energy cleared Kusaka's new form was revealed to them, he has transformed into a humanoid dragon made of purple ice.
As Kusaka revels in his new power, Kenpachi surprised everyone as he ran towards him from behind, surrounded by yellow Reiatsu. He slashed with his sword in basic form trying to cut him up, but then with his Dragon Hand Kusaka grabs his Zanpakutō and generates a large amount of ice.
As a result, Kenpachi got hit by it and got blown away with Kusaka flying off at the edge of the hill which made Kenpachi fall to the ground.