This is in many cases not true. Had the writer watched sufficient wildlife documentaries, he would have, as I have seen a number of contradictions to what he wrote. I have watched a number of cases where hyenas, by force of numbers and their own very powerful jaws which are know to lions run several female lions off a fresh kill. Even to the point of chasing individual lions up onto low tree perches. The only lions that hyenas truly fear is the large males, who are the only lions powerful enough to crush the hyenas spine with a single bite.
Carrying a concealed firearm presents to a criminal that I am unarmed. Every study I’ve ever read, not most but every study, says that criminals will avoid an armed person or home when selecting a victim. That only makes sense, right? Robbers, rapists, or carjackers might be dumb and opportunistic, but they have the same instinctual sense of self preservation we all have. Hyenas don’t attack lions to steal the gazelle the lions have just killed. It’s all about risk management; are the potential gains (a tasty gazelle dinner) worth the risks (pain and damage the lion’s teeth will cause), and does the hyena really need to test the lion to figure out the answer? No, the hyena can see the lion’s teeth and knows to stay well clear.