It’s pretty hard to fault someone out in the wilderness for tripping when backing up while being occupied with trying to save his life by shooting at a bear.
Granted, LE are trained to shoot and back up, but I’ll bet it doesn’t include this kind of scenario in the out of doors with uneven terrain and rocks and sticks to trip over.
And a bear that wishes to crunch crunch your cranium.
When I was a LEO firearms instructor we trained on out door ranges. That had a bit of uneven ground.