Have you considered that perhaps it's simple case of brown-nosing?
I could see him admiring a person's way of teaching and adopting certain traits as his own. I'm sure we all admired certain elders and tried to imitate them in our own assignments. But the diamond thing is just a little too weird, and way too specific.
I only watched a few minutes, but never noticed him doing the diamond with 2 hands.
I don't remember the specific time it happened, but he definitely did it.