Just found your post Cheif....Something spooked him whether it was a slight noise, maybe some movement or perhaps he got a quick whiff of you it's hard to say. My thought is if he spooked and wouldn't return to the call that brought him in then I would put that call away for a while as I am sure he may associate that with what ever alerted him now. If that was him that returned but you couldn't see my thoughts are that he was trying to circle downwind of you and maybe now he does have confirmation of what you were. Hard to say how long but I would guess he won't put himself in the same position twice this season.