So, let me get this right, I don't want to jump to a conclusion, it can't be done, is that what you are saying?
Well, it's being done, apparently--the question is how exactly. My comment is that if you, or me, or any other reader can't replicate the throw and reproduce the same results, then there's something fishy going on.
Take a common knife throw: you can see someone throw a knife into a target and think "
I could do that." And I'm guessing I'm right, because at some point that
did happen to you, or you might not be here now!
But if you see something and think, "How the heck is that possible," then the odds are quite high that you're being tricked. Consider the guy who throws knives at the lady on a rotating target while blind-folded. That's not something a real knife thrower can do...and indeed, there's a trick involved.
There may be very little to the trick, in reality. Sometimes, it's the folks who record the sequence who do fancy stuff with editing. Sometimes it's a simple thing that's exaggerated beyond belief. Other times, sadly, it's trickery intended to fool the public.