These videos always blow my mind. I wrote a blog last week about a similar situation where a bear ran up a hunter's tree stand and the guy reacted the exact same way - by not reacting.
Which I get, you don't way to "die", but I'm starting to get bored. Run. Scream. Throw things. Call the bears bluff and see what happens. React like a human. I get that this kid was probably stoned? Maybe? But still, I would've at least stayed quiet once I saw the cub. Not asked the bear "what's poppin?"