I didn't read that in a magazine, after reading a lot of things on the forum and about coyotes I figured if you sound like an intruder, sound like your hurting a pup or trying to take there food as well as a grey that I hear they don't like, that might be enough to piss one off or to atleast make one want to come a checking on what's going on.
I have an awesome hunting buddy and we both hunt the same way so no problems there! It wasn't always like that but then ill never hunt with those guys again.