the guy did the best he could have under the circumstances. it's one thing to watch a video and be an arm chair quarterback, it's another thing to face down a moose that has already attacked you once. they can easily kill a man and have kill many times before. don't be so quick to judge what to do until you've been there.
You should watch it again. The snowmobile never backed off. He always moved towards her. After the attack he moved towards her again. He is, was and always will be a dumb azz. The wife and I ran into a moose and her calf on ATVs last summer. We were in the wrong place and sat there for over 1/2 hour before the calf finally left and the mother decided not to kick our butts. If you pay attention there is usually an out. When you don't this crap happens. When the video first starts you can see the moose is mad. He should have found another way. She wanted the trail and if he had left the trail and got stuck she would not have entered the deep snow to fight. He should be ticked for poaching and carrying a concealed weapon. People like this ruin everything for us.