At first I thought this would be holding the blade only and whipping your hand downward so the handle slams open. I had to find a video because I've never heard this term before. Now that I saw what they did I can't see how this could harm a good knife , much less a premium one. Like anything else if you do it every day hundreds of times eventually something will wear out. I doubt it would hurt it if you did it just when you actually need to use the knife.