Well, fathobo you are a great guy.
I am not saying you are wrong. But just think about it for a moment.
Regardless how much padding you have there, there are many possibility.
First of all, while spinning in the air, it's a circular, angular motion. So in a simple circular motion, we know the velocity is tangent to the direction of motion. Now that's being said, once the object is release, it will fly out in any direction that is tangent to the point it is release. The kids could have fly toward the wall. If their heads hit first that could be a severe head and neck injury.
When you slided the box on the floor, you wouldn't know what happen inside the box. Maybe they were poking each other and when it hits the floor (the box gets turn over), their fingers could poke into each other' eyes. Or if he falls while sliding the box (maybe he loses the control), that's even more scary.
Also, when he use the pillow to take down the kids (when they were jumping), head and neck injury again?
I am not saying this video is a bad one/ But it is not fun when it comes to kids because their neck and shoulder aren't strong enough like we do. It's like "you don't spin or pet on a baby's head" because their heads are so heavy while the necks are soooo weak.

fathobo, please don't get me wrong. I love ya all. LMAO