Check this out. Another video of the same dude doing the same thing. He's known for doing this, and it ain't fake.
Discussion
He’s got a whole channel of him doing this 😆
In some videos some dudes pulling him by the ear, hilarious
I just saw a slowed down version of the original vid I posted and you can see how he positions his fist like 2in from the stone and just explodes forward and knocks the top half off. No video edits.