The instant Yondu stops playing along, Vegeta freezes each orb in it's place. They may still look rather menacing, he being surrounded from all directions from them, but they won't move unless Vegeta wants them to. For his part Vegeta is mid sip from his sports bottle he normally brings along for breaks, raising a brow at Yondu's shock and surprise.

Then barking back, "What did you think it was for, decoration?!" Not that Vegeta uses it a lot to show off. He will now and then in the kitchen while cooking, to grab stuff if his hands are busy, but for the most he keeps it safely wrapped around his waist. And of course for training when he's focused on fighting with it. "It's another limb."