Shoot a Grizzly at a "safe" distance and you will be on the other side of those bars man. You'll also have a lot skinnier wallet.
Exactly, shooting any bear without the proper tag from a "safe distance" is a no-no. Years ago, a former co-worker got a $7,000 fine, lost his rifle, and got a five year hunting prohibition for shooting a grizzly that he thought was about to attack. The MOE guy drove out to the site, took pictures and measurements, and determined that the shooting wasn't warranted.
Watching that video, I am VERY doubtful if spray would have worked.
Have you ever seen bear spray being used? I have, up close and personal, and it worked.