Why this trick should be IMPOSSIBLE ft. Rodney Mullen - Skateboarding Science

At 5:36 you say the board begins spinning out of control. Either you do not understand physics or you don't understand skateboarding. The trick he is doing is an anti casper stall and pivot, that's him standing on the board upside down, turning. Then he flips the board. You can see the board is rotating on 2 axes. There are skateboard tricks like the impossible that are done without the aid of your foot. The board doesn't become unstable because of a thing called inertia. The video you posted about the tool spinning in space is also an example of a thing spinning on two axes. It's just that at the point of shift the duration of the shift is just so that it seems to flip around chaotically. You said spontaneously, but it isn't. There is a rhythm. It may take a while to see it, depending on the speed of the rotation of each axis. Come over and skate with me. I'll teach you all kinds of science.