Why Should the Phantom Troupe Return the Rabbit They Stole to the Zoldycks?

Bulla was turned into a little creature that was neither quite a cat nor quite a rabbit. The good news was that she was picked up by a human child who was also a little one. The bad news was that this child wasn't much better off than she was. With no other choice, Bulla Rabbit took on the responsibility of protecting the child and his younger brother. Killua once had a pet rabbit, but one day it disappeared. A few years later, Killua was shocked to see the rabbit in the arms of the Phantom Troupe's leader! What a troupe, what a bunch of spiders! They'd even steal someone else's rabbit!! Absolutely unforgivable. Chrollo: You say she's yours? Feitan: We won this rabbit-cat fair and square. How does that make her your rabbit? Phinks: Does she look like a rabbit to you? She's obviously a rabbit-cat! Killua: Damn spiders... Then one of the two spiders got smacked in the face with a rabbit ear. Their cheeks puffed up at once, and the two spiders stared at Bulla Rabbit in front of them. Phinks: Fine, we shouldn't have been so harsh on the kid. Feitan: ...Just some kid from the Zoldyck family! Chrollo: You say your name is Killua. Do you want to join the Phantom Troupe? Killua: ??? Theme: Face the setbacks that may come your way in life with a positive attitude