The same series of questions you asked me I could apply for everyone who makes a counter argument. No one here understands exactly how the chicken works and explains it in details. In the video, the guy used brute force to break the chicken legs, just a little bit more and the legs will be removed from the body. How could it stand up after going such pain? Even for standing up, the legs won't be in the position and will be dislocated again. Unless while he was pulling the chicken, he put in his hand some kinds of "glue" to paste the legs back? Possible explanation?
First, you simply don't have the perspective to make any definitive claims about how much force he did or didn't use from the video alone, particularly as sleight of hand deliberately makes manipulations appear different than they are. If he re-located the legs, it doesn't matter what position he sets down the chicken in. But the specific explanation is irrelevant to your argument for the reason below, with one (and only one) exception.
Magic is something for which there is an overwhleming amount of evidence to indicate that it does not exist, and little evidence in support. Regardless of any potential explanation I can provide, Occam's Razor will apply. You should prefer the explanation that forces you to make the fewest assumptions. Positing that magic exists is a massive assumption given that there isn't much evidence in favor of it. Positing that he's using slight is a far smaller assumption, as magic-peddelars have used it in place of magic for centuries.
So no matter what the ultimate explanation is, any possible explanation which does not involve magic should be preferred to one that does involve magic. The only time that the specific explanation matters is if the true, accurate explanation is magic. And there's no reason to assume that that's the case, with all of the insane, revolutionary implications that would have, just because you can't wrap your head around the display. And that's the crux of your entire argument, that you can observe yourself not being able to provide any non-magical explanation. That's not very convincing to me.
Yes, it's possible to be a trick and not a trick until it is discovered. People think magics are tricks because, as you said, they relate to knowledge they posses themselves. Thus, when a magician performs, people always assume that's trick (and mostly it is that way). The statement they assumed is always true, but is it in reality? There are so many things science has not yet explained, such as ghost, spirit. People are still finding answer for it. Once the mystery is solved, it become science anyway. It means, supernatural or not, once it is understood, it's part of science.
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There's not much solid evidence for the existence of ghosts or spirits, but that's irrelevant. If you perceive something but can't explain it, that doesn't make it magic. True, once a thing that does indeed exist is understood it's considered science no matter what. But in that case, the concept of explaining something you don't understand as "magic" is completely valueless. With no apparent explanation from the guy in the video himself, there's no reason to ascribe a bunch of characteristics to whatever it is you think he did.