THADDEUS: a bit confusing, isn't it? you can fool a coyote's ears with calls, even sounds that are not normal for the area. you can sometimes fool a coyote's eyes with a decoy, piece of fur, or whatever (but don't let him see you move). however, it seem virtually impossible to fool a coyote's nose.
i've shot coyotes (long shots) that came in from directly downwind while i was calling downwind, but there was a looooong open area with a clear view and a stiff breeze. who can say where that strong wind was moving and mixing up human scent?
coyotes with less experience (juveniles?) can come charging in from any direction. more mature coyotes seem to have a much stronger inclination to get downwind of the calling sound and figure things out before committing. remember, the adult coyotes have had plenty of experience finding food for themselves, so they don't have to always charge in and grab.
if you ever hunt in snow (in arizona???), when you leave your setup, wander around downwind a ways and look for fresh coyote tracks.
as you move around hunting this ground and that, the ever-changing combination of terrain, vegetation, and wind makes coyote hunting intriguing and challenging. applying specific rules all of the time seems impractical to me; bend the rules here and there, but always keep in your mind the thought of that coyote's sense of smell.
