Okay... I've watched the video several times... IMHO, they did it right, they had no choice... and the "distance" that they pulled the trigger at is irrelevant...
IF that bear was 12 or 15 or 20 or 25 METERS away, most of us would have shot... these guys shot at 12 FEET, about 4 meters!!!
It is sad to know that the sow was just doing what came natural, protecting her cub... she paid for that instinct with her life and unfortunately, the cub likely died at the hands of a boar or starvation...
Cheers
Jay