.22 Magnum CAN kill you- but absent a shot that penetrates the brain, or cuts the spinal cord, it will not STOP you.
Yes, the bad guy bled to death- 10 minutes after he beat YOU to death. At which time, what happens to him is now irrelevant to you.
As much as I enjoy my .22s for target and small game, the ONLY .22 I would rely on for self defense was called the American 180.
.22LR, 177 rd magazine, full auto at 1200 rounds per minute.