I am a bowhunter, actually more of a bow shooter than a bowhunter. When I am home and the weather is nice, I shoot almost everyday, I am lucky enough to be able to shoot in my backyard. When I am shooting for group, which I rarely do, out of every few thousand arrows I shoot, I get what is called in the archery world, a robin hood. Which means that I shoot one arrow into the back of another. Most of the time both arrows are ruined, always the one that the second arrow is imbedded in. In 30 years of shooting a bow I have done this maybe 10 times, I have no idea how many thousands of arrows I have shot over that time period. Now 10 robin hoods proves without any shadow of a doubt that it is possible, I have several joined arrows hanging in my garage as more proof, however it is very unlikely, verging on impossible, to do it on purpose with any regularity.
IMO killing a free ranging bear with a 22, trying to do me harm, before said bear can inflict serious injuries, is on the same par as a called robin hood. A 22 will kill a bear, with out a doubt, if it is all I have and I feel my life is in danger I will use it, post haste, and hope for the best, it would never be my first choice. Chris