I THINK I MAY KNOW HOW YOU CAN WORK THE THROW!
Now, I'm a pretty ametuer coder, so I may be wrong. You could make it so when Wario grabs a stone, the stone disappears and Wario turns into the animation that lets you aim the stone but in actuality, the stone is gone. Then, you can make it so that when you release the throw button, a new stone that looks exactly like the other one but goes the way you aim is created. Like I said, I may be wrong.
Now, I'm a pretty ametuer coder, so I may be wrong. You could make it so when Wario grabs a stone, the stone disappears and Wario turns into the animation that lets you aim the stone but in actuality, the stone is gone. Then, you can make it so that when you release the throw button, a new stone that looks exactly like the other one but goes the way you aim is created. Like I said, I may be wrong.