There are only two confirmed fatal coyote attacks on humans, 3yo Kelly Keen in 1981, who was rescued but later died at a hospital of blood loss and a broken neck, and 19yo singer songwriter Taylor Mitchell
in 2009, who was conscious when rescued but later died of blood loss at a hospital. A lot of study subsequently went into the Mitchell attack, as coyotes are known not to be aggressive towards humans, non-fatal attacks also being rare. Apparently, pressure due to lack of prey caused coyotes in the area to target larger prey
Coyotes will not stand to be whacked, crenellated or not. A person is more likely to hurt their pocket, dogs, or self with sharp edges on a flashlight, but if it makes for good feelings of security, oh well hopefully using it will not result in assault charges with a deadly weapon.
I am in full agreement with KITROBASKIN, that crenellations will end up giving the user minor wounds and damaging pockets, always, and I can only add that I have never heard of anyone ever using crenellations. I believe, though legal to own and carry, that they can't be used. It is only my conjecture, but if they ever were used in a self-defense situation, except
in the occasion of total war, without a witness I give it equal chances the victim is prosecuted, and if with a lucky strike a death occurs, again without witnesses, there will undoubtedly be second degree murder charges filed against the victim, unless they are extremely sympathetic, such as elderly or pregnant, or the attacker is a usual suspect with a long criminal record.