I was told (and my family are Kohanim) that it is assur to put the two hands together with the fingers split that way, if you are not a kohein who is duchening. That is because the formation of the two hands together is the shape of the letter shin and the Shechina flows throw the kohahim’s hands when they are in that position, which is a reason why one may not look at the kohanim at that time.
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