Several years ago, my hunting partner and I were calling an intersection of two 2 tracks. The roads formed more of an x than a +, we sat back to back and a coyote came out in one of his roads a couple hundred yards away, coming to the call in coyote "road gear". He said, "coyote" and I turned around and watched through my binoculars. Coyote kept coming: I could see his tongue hanging out as he ran towards us. Couldn't get him to stop and somewhere around 100 yards my friend took the shot (30-06 w/150 gr. SP) and coyote went down like a ton of bricks.
When we looked for a bullet hole, there was none.......entry or exit, no blood, nothing. We didn't do a necropsy, but only thing we could figure was the bullet entered the coyotes open mouth and hit spine lengthwise preventing any exit.