If the pepper doesn't deter them, the follow-up slugs will.
Actually bear spray does usually work, even on grizzlies. But not always as we can see. Best to carry both spray and a firearm.
I’m curious as to whether these victims had food in their tent. Always hang food up well away from your tent. It’s usually food that attracts the bears.
No food in tent. It appears they were scrupulous about food.
Pretty clearly a predatory attack.
If the pepper doesn't deter them, the follow-up slugs will.
No bear spray does not work very well on predatory bears of all types.
It works half way decent as a harassment tool if the bear is not intent on harming you.
On bears intent on eating you or in tent on harming you it not very effective.
Isn’t both a risky proposition? Bear charges are so fast that you would have no time to fire the spray, drop the canister, unholster your sidearm, and shoot. You have time for one or the other.