"He was quartering to me, and I shot him in his left shoulder. Ne went about 15 yards and lay down, when I got to him he was looking at me but couldn't rise, a coup de grace was required. (Thats twice this year, whats up with that?
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What organs were hit?
Sometimes, when they fall in sight, death seems very slow in coming (from our point of view.) I've had the habit of filling deer with holes, when my first shot would be fatal, especially when I hunt in an open field, and they can't get out of sight. When I was younger, I shot a running buck 5 times, the first 3 shots making a respectable group on his liver. any of those would have been fatal, but he kept running, and I kept shooting!
Archery hunting has taught me to slow down. usually the deer is out of range for a second shot, so I just watch quietly.
There is nothing wrong with ending a deer's life immediately with a second shot, it is very humane. But, if you are sure the first shot did the trick, there is a lot to be learned from silently letting the deer die in peace.
One more thing, I probably would have shot it again, too!