Okay, the idea of attempting to call a coyote that has already seen you, you usually won't get very many, especially if he saw you shoot at him, or his buddy. So, what can we do?
Sometimes, for instance, you get his buddy and he books. Well, maybe he did, (?) but not too far, he is just out of sight. Sometimes they will look back just before they reach cover. A clue. This means they might be waiting for buddy. A hurt pup may get you a look, maybe not?
One time, years ago, I broke off a stand, and went out to collect what I had on the ground, while my partner was circling around in the other direction. He didn't have to go far, but as quietly as possible, selecting a spot with a nice field of view, and started a low coaxer, or lip squeak. The other guy, (me) had the attention of the coyote that was out in the brush, but he overlooked the partner. This works, I now do it all the time. I will also do it all by myself, if you can move without being seen. I told Jay Nistetter how to do it a few years ago, and he got the animal, the next time he tried it. It's amazing, just a little change of direction, and the coyote can be called eagarly, when he ain't buying it, where you used to be. Of course, this isn't going to work out in the flats, you need to understand when to apply it, but I assure y'all, you will get shot opportunities, if you handle it properly. They are so smart, and yet the instinct to come to a distress is so strong, they can't help it sometimes. It feels good when you get one of these, all but lost animals.
Now, truthfully, I have been using two machines for more than a couple seasons for just this sort of thing. Many times, I don't even turn the second machine on, but under the conditions described above, suspicion seems to be removed, and the one that got away gets dusted by that second sound coming from a different LOCATION; which is the more important consideration. Some guys can't use this, but in areas where you have a high population, and enough cover, I have found this technique to be worthwhile.
Good hunting. LB