In Episode 45 of Hunter x Hunter (2011), titled "Restraint × and × Vow," the Shadow Beasts are eliminated by the Phantom Troupe, and Kurapika questions Uvogin, leading to a temporary, shaky alliance with Hisoka. Uvogin is rescued by his comrades, during which Dalzollene is killed, setting the stage for a personal fight between Uvogin and Kurapika.
You can watch this episode and find detailed information on Hunterpedia and read discussions about it on Reddit . Hunter X Hunter 2011 Episode 45