It’s rare for coyotes to attack a human, let alone even get so close. But it can happen.

Take home point is it’s good to be carrying something that can contend with critters, especially if you’re out in the backcountry. I’m still in the market for a good such gun, probably a .44 Mag revolver at this point but still undecided (not much point in making a final decision until the budget permits). In the front-country (i.e. city), OC spray can be useful here.