You're missing the point.
No one intentionally decides to drop it in any particular fashion. It can fall in safe way or a harmful way. A bumper is supposed to protect the device from such accidental falls.
A real testament to a products durability is that it WILL stand up to this kind of drop. Not that it can't. You all seme to have things backwards. The demonstration was real-world. This type of fumble/spin can happen easily. I'll give you an example. Let's say you lose your grip on the phone and its beginning to come loose from your hand. In an effort to prevent it from falling, we bobble the phone in our hand, trying to secure it, so as to prevent it from falling. Sometimes you are able to recover before it falls to the ground. Other times you're not. As youre reaching for it, and bobbling it in your hand, you will inadvertantly create a "spinning" inertia.
