That's one of the popular explanations... But I'm not so sure. I grew up with some serious martial artists, and they were incredibly fast. I knew this guy named Lai Mai who was Vietnamese, and practiced Tae Kwon Do and Vo Vi Nam. He was the fastest human being I've ever encountered. He could kick you and you literally never saw his leg move. It was on the level of this video. Impossible speed. So, while I can accept that this was a video editing thing, I also accept that this could be totally authentic.
Discussion
Could have been switched to softer wood. Any time you have FPS is an opportunity to switch something. Hollywood or I see it to believe it even then I could be tricked. Stay frosty folks! Don’t focus on one thing too much either.
It's not wood. It's a stone slab.
Brittle!
The fact that broke the stone isn't what's amazing. His speed is what we're talking about. If you notice, he jumps on the stone slab a few times before setting it in place. He does that to create microfractures which makes it easier to break. But like I said, that he broke it isn't real special. The speed in which he broke it is.
Zoom zoom