I once knocked a bird down with heavy shot and while standing over the bird giving high fives to my son the bird stood up and flew away. I watched him fly into a cow pasture and then run another 400 yards to the wood line. Looked all day and never found him.
The bird was flopping around at my feet and not able to lift his head and then... Bye Bye.
I will never let that happen again. I always grab the bird by the neck and choke him until he gives up the ghost. OH by the watch those spurs, they hurt.