*he highly concentrates due to the fact that this is a very complicated technique*
He starts collecting his Futon chakra in his stomach. When the chakra is ready and he has enough of it, he starts moving it toward his gullet. While the chakra is travelling, he spreads out his hand with his fist opened. His palm looks just like Naruto's when he's performing Rasengan. When the chakra gets to the end of his mouth, he uses shape manipulation and slowly starts spitting a smaller wind stream. He controls the wind stream to hit his right hand and just after it does that, the hard part comes. He makes the stream to start spinning just as it touches his hand. He really bedevils doing that but in then end, he succeeds and has a spinning wind ball in his hands. Now, he just locates the clone and severely releases and throws the ball from his hands towards it. When the ball hits the clone in it's abdomen, it releases a massive power, easily destroying the clone.
This is such a great technique for people who haven't learned Rasengan yet. It's really powerful and can pierce through many defenses, which is it's another benefit. Although, when you're trowing it, it's a high possibility that you'll miss, especially when the opponents in far away. The safest thing is, if you're able to, hit the opponent with it directly by coming to him.