Oh, about how would I feel if I shot a friend that was being mauled by a bear? It's more like how would I feel if I didn't have a gun, like a stupid idiot, that's how. Singing wouldn't help, really. Didn't you read about maulings just last year? Immediate full on charge from  100 yards with people making plenty of noise, only stopped by fire arms. Others maulings occurred after full charge through text-book spray application. A personal friend was only "partially" mauled because his friend stopped the attack with a rifle. Maybe some people aren't safe with guns, hmm. Wonder where their from? 
Believe me it's no fun when you have to pull the trigger but you are thankful it's a option, the last one you have.
They couldn't even retrieve the body in today's story because the bear wouldn't leave the body until someone with a gun showed up. This is on a trail that had 200 loud, and smelling runners on it. Have any "suspicions"?