Looks like the coyote literally ripped off its own leg . . . . maybe. Because as he approaches the body, my friend sees this:
The coyote has been eaten, and judging by the tracks, it was a mountain lion! So did the coyote ripped its leg off, and THEN get eaten by the lion? Or was this just the scene of one helluva violent struggle?
A return to the site the following day shows that the lion came back to finish the job, and now the hunt is on for the lion . . . .
Happy Hunting!