A 40lb cat jumping on you is indeed a threat. Many of the places I go are around a hour from help ,no phone service mostly and my 44 mag super Blackhawk is at hand. Some also recommend a knife to more or less gut a cat that has decided to attack. So far never have I been attacked I do keep my back to a tree or a large rock anything to hinder ambush from the rear.Agreed, I should have stated I was referring to Oregon where the guy lost his life.
As to Bobcats, they aren't a threat unless they have rabies, now a Mountain Lion, that is a whole different ball game, they can kill you, and one of my fellow hunters was stalked by one, but he did have a rifle!
Cheers
Richard