Dino confidently announces his entrance. Hibari questions Dino why he came here, to which Dino replies that he merely came at the will of Reborn. Xanxus, Mammon, Fon, and Hibari are all shocked to hear this. Dino reveals that Reborn had told him to take Hibari's side if he was losing, as it would be troublesome if he lost. The two Arcobaleno wonder what was in Reborn's mind, but Dino shrugs and replies that all he knew was that it had something to do with the reason he decided to join the Representative Battle of the Rainbow so suddenly after being so reluctant. Mammon still puts up a confident face and announces that it didn't matter who came to fight them; he and Xanxus would destroy them all. Xanxus, however, tells Mammon to stand down, as he was heavily injured. Mammon protests, but Belphegor tells Mammon that Xanxus just wanted to fight alone. Mammon desists and reverts to his cursed form.
Hibari also tells Dino that he wanted to fight alone, but Dino seriously replies that if Xanxus got serious, he wouldn't stand a chance. Hibari, annoyed, tells Dino that he was acting high and mighty again, but Fon supports Dino. Hibari brushes them off and prepares to battle Xanxus. However, Dino, with a mischievous expression, calls out to Xanxus that he had vastly overestimated his abilities, as he had already lost to Tsuna. Xanxus immediately flies into a rage, much to the shock of Team Mammon, and Dino notes that his fury had made his old injuries surface. Xanxus angrily releases Bester, following up with his Cambio Forma via his new Varia Ring into Pistola Imperatore Animale, then destroying the spiked balls Hibari's Box Weapon Roll sent at him instantly. Xanxus charges up another shot, and Squalo notes warningly that Xanxus's shot would destroy the entire floor. Belphegor quickly jumps out of the window with the unconscious Levi A Than and Lussuria in response.
Fon and Hibari hopelessly watch, but Dino quickly appears beside Hibari and tells him that Xanxus's Boss Watch could be destroyed in the slightest of openings, and that his Vongola Gear would be he weapon to do so. Hibari recalls that he had previously asked Dino why he chose a weak weapon such as the bullwhip, to which Dino had responded that it wasn't weak, and that it was flexible as well. Hibari is confused, and Dino explains that with the whip, one could attack the vital points of an enemy through openings with practice, and that the accumulated force from the kinetic energy wouldn't be weaker than his tonfas. Dino then offered to teach how to use the bullwhip to Hibari, but the latter had refused. Hibari, stopping his memory recollection, holds his left tonfa loosely, with the chain hanging out. Xanxus fires his shot, and Dino sends Hibari a warning- however, Hibari tells Dino to shut up. Hibari charges and strikes down with his tonfa's chain, but a huge explosion blows up the entire top floor of the building.
Note: Bold + Italicized = First Appearance