Wilf Wolf's Party

Wilf wasn't sure if he'd be good at a dance contest, but he had to try. Wilf was running out of time to throw his party, and needed to make Owls day count. Wilf decided to challenge a nearby gang of Rockhoppers to a dance contest. He probably chose them because they reminded Wilf of Happy Feet. Happy Feet is one of Wilfs favourite movies.
"Hey! You there!" Wilf calls out to the gangs leader
"What do you want little wolf" the leader replies
"A dance contest! If I win, I get to join your gang"
"And if I win?"
"You can have ALL of my money" Of course Wilf failed to mention that he had no money.
"Deal" The leader shook Wilfs hand. "The names Hopper, by the way"
"It's on"
And just like that, the contest began, with Hopper and his gang going first. Hopper wasn't a great dancer, but the gangs chemistry was undeniable. The Rockhoppers essentially just shuffled from side to side (and sometimes in circles), but they were so in sync that Wilf knew they would be a hard act to follow. After a few minutes, the gang finished, it was Wilfs turn. Luckily for Wilf, he did his stretches this morning, just like Bo taught him. First WIlf slid from side to side, then he did three backflips in a row, and finally, he spun on his head in circles. It was short, but effective. Hopper knew he had been beat.
"You're quite the dancer big Wolf, do you stretch? You like like an animal that stretches"
"Thanks Hopper, does that mean I'm in the gang?"
"If you want to join, you're in"
How does Wilf respond?