That is not exactly a natural placement of fingers is it?
It doesn’t look natural at all to me. It looks like the LH has three or four fingers “woven” under the pointer and middle finger of the RH and then resting on top of the remaining two fingers on the RH.
When I practiced with my hands, if I took the 3-4 fingers on the LH and wrapped them around the RH it felt more natural.
RH thumb is hidden. LH thumb, partially. They are locked into position by the other fingers. Hmmm...
The position he has them in felt quite unnatural.
Wish the image was a clearer.
It does make me think it is some kind of signal. I wish I knew how long that picture has been up.
Wonder if there is a directory online for hand signals...