Not sure why you’re being downvoted, the term Coywolf is in the Wikipedia article

Sometimes true, but not in this case.

Various other proposed explanations why the unusual attack occurred included that the coyotes might have been larger and bolder than normal coyotes because they were crosses with wolves or domestic dogs, rabid, starving, or protecting a carcass.None of these suggestions were subsequently borne out

They just got tough and mean on their own.