I was talking about this incident with my dad, a retired mail man. He pointed out a few interesting points to me. Being a mail man he has experience with both attack dogs and pepper spray. 1 their are types of dogs that are immune to pepper spray i.e. pit bulls, and other types have a higher tolerance to it i.e. Rottweiler's. 2 to stop a dog from attacking it has to be a direct shot, it can't be a close spray it has to be dead on, for this reason mailmen carry a form of bear mace not self defense pepper spray. So, with this in mind would a man so scared of a "warning bark" that he ran and jumped unprovoked into a freezing river be able to get a direct spray on a wolf? and would pepper spray work on a wolf?