Somewhere in the middle of the episode Spock goes into plack tao(Vulcan for blood fever), and goes to a cliff to meditate. Then there is a shot of him sitting or leaning against a cliff. His hand are together, head bent down, and extremely focused. The next shot shows Kirk talking to T'Pau (I think that he name). If you look closely in the center of the screen by McCoy's stomach, you can see Spock leaning against the cliff with his hands behind his back, looking around the set waiting for his next shot he is needed in.