In case you haven't had your coffee today, this should get your adrenaline pumping. If you take a look at the 23 second mark you'll see a baby bear cub, which is most likely what triggered the attack.
This dude clearly read the books and did his due diligence when it comes to bear attacks. He shouted, made himself seem big to the bear, punched it in the nose and face. And he even kicked it down the mountain for good measure. 10/10 form all around.