There is nothing in the definition of Condition Yellow that would require someone to keep turning his head.
Combat Mindset—The Cooper Color Code
'You can remain in Yellow for long periods, as long as you are able to "Watch your six.
" Hence keep looking around.
And from Jeff Cooper's Principles of Self Defense in the chapter on Alertness:
"Two rules are immediately evident: Know what is behind you, and pay particular attention to anything out of place. "
on page 7.
Jeff wrote to keep your head out of your posterior and understand your surroundings. This is the basis of alertness.
, Jeff pointed out his color code system was more of a mindset and being willing to use whatever force is needed. That is break your inhibition to use it if need be.