I know I've been winded and spooked deer that way, but if you freeeeze, they may know something is up if they see you but won't spook if you don't move (if the wind is right). I've had many encounters where the deer and I entered into a staring contest, and if I hold my ground and dont move, they usually get back to feeding. They look every now and again, but if they dont catch you move, they eventually forget you're there or at least give you the opportunity to draw when they move behind a tree, look the other way for a few seconds, etc. It is unbelievable though how they can wind you when you know they didn't catch you visually.