10 shots on a charging bear? Amazingly fast shooting or a very slow bear...
The antler-seeker started shooting when the bear was 10 yards out. It is likely the early shots slowed the bear a bit, and might have deflected it a little.
It is not hard to fire 10 shots in two seconds.
The record holder fired eight accurate shots at close range from a revolver, in one second.
It probably took the bear more than two seconds to cover the distance.