So the definition of plagiarism is: "to steal and pass off (the ideas or words of another) as one's own : use (another's production) without crediting the source" (
https://www.merriam-webster.com/dictionary/plagiarize).
I can't find any website that has the same ideas or wording that
@WitchDocIsIn used. In fact, a Google search using his wording only turns up his post. For facts like his first name was David and the years of his birth and death, no citation is necessary because those are generally available facts - not words or ideas. I don't see any plagiarism here and I think you are wrong to make that accusation.
However, your post seems to be a paraphrase of information (without attribution) contained on several websites all of which presumably are taking it (without attribution) from the introduction to The Dai Vernon Book of Magic. Of course, I'm assuming of course you don't have the original newspaper article (which if you did, you should have cited) and weren't there to see people misname "Vernon" for "Verner" or didn't hear the story firsthand from Dai Vernon himself. So where are your cites to your sources? "
But wait," you say, "those are all facts - I shouldn't have to cite them." Exactly. So is what
@WitchDocIsIn posted.
These forums aren't Twitter where you get points for "owning" someone. Be respectful.
P.S. I deleted the video you posted because it was unnecessary and added nothing to this conversation.