1. Most callers will be calling and get a set of eyes at long distance and have the animal coming in and take the light off for seconds to look in other directions for additional eyes and the predator coming in will see them in the back of the truck or in the high rack and go off.
2. As the animal is located with the light you can make no noise, the sound of metal against metal, or whispering will give your location away and turn the animal back in the bush.
3. A lot of predator hunters keep the mechanical call going once the animal is located, it is my experience that as soon as the animal eyes are located, shut the call off and make the animal come on in and find where the thinks the sounds is coming from.
4. An animal will give away his intentions on coming in or hanging up by his body language and movements . Most hunters get an animal coming in and it hangs up and moves back and forth sideways, at this point he is done and has decided it is not his game. Your only shot will be then, and you have to take it.
5. I find one of the most important mistakes is using the light, I always move slowly in circles, if you move fast and the predator has any elevation coming in he can see you as you make the fast turns with you hand and light, and will hang up, or leave.
I have had the opportunity to observe all of this first hand through 3rd Generation Night Vision. In the last ten years I have called in at least 750 to 1000 predators each winter and watched the whole animal not just the eyes and the body language on every set. I have called in Javelina's, lions, fox, bobcats, coons, coyotes, wolves and been able to observe all there behavior coming in.