I can agree the "assumption" in this case may be less clear than when this close reason is usually applied. But, you still seem to assume (though question, so that's good!) there is anything more going on than a magic trick, or "art" as the mentalist pointed out.
So although I agree the assumption you make in your question is very limited and made explicit (thank you), as Bryan points out, magic is still off topic here.
That said, it could be that some techniques used by mentalists could be considered on topic here. Focusing on this and linking to relevant terminology/literature may work. This is what it means to "frame question in psychology or neuroscience". That will require some more initial research on your part. One thing which comes to mind is "cold reading", which could potentially be explored/asked about from a psychology perspective, if any such questions pop up when reading about this.