Keeping this in view, what animal can kill a bear?
The list of what eats a bear is short, as Apex predators and carnivores. Most other animals have more to fear. But tigers, other bears, wolves and especially humans have been known to attack and kill bears.
Subsequently, question is, who would win in a fight between a tiger and a bear? Winning facts for both Grizzly Bear and Siberian Tiger: Siberian Tiger is far better hunter than North American grizzly bear. Both grizzly bear and Siberian tiger paw swipes are equally powerful but tiger is more technical than grizzly. Siberian tiger canine teeth are longer and thicker than grizzly bear.
Similarly one may ask, can a human fight off a bear?
A bears claws could shred a human to bits and their bite can crush bone while a humans punch would do nothing to the bear accept piss it off making the bear even more motivated in winning a fight. So no unless the human has a weapon there is no chance in winning a fight with a bear.
What is more dangerous a bear or mountain lion?
Also, unless they have cubs, black bears are far more wary of humans than are mountain lions. They'll hurt you if you mess with them or their cubs, but with a few exceptions, namely grizzlies and polar bears, they aren't aggressive and won't hunt you down and kill you. A mountain lion will.