[Dantilla]

My wife took a class in proper use of bear spray.

Bottom line: Do NOT spray right at the bear. Once the bear is close enough, you are to spray towards the ground between you and the bear in an arc .
The spray bounces up, creating a "wall" that it will not cross.

Spray at the bear under duress, and one may spray right past the bear, and to get away from the spray, the bear may run straight ahead.
Without the "Wall", the bear will be unpredictable.
Even spraying right in the face may not be effective. Yikes!

There needs to be a "Do not cross" line in order to repel the bear into retreat.

Like others have mentioned, Black bears are no threat (just don't get between momma and her cubs). Black bears avoid humans

Grizzly? You ain't the top of the food chain.