28 yards in the heat of the moment! Maybe you didn't hit him quite where you think you did. A little forward and down you could have hit the knuckle not the scapula. Can be a tough place to get an arrow in..
I hit one in the shoulder last year and relive that moment more than some kills. I think the knuckle ( if thats what it's called ) did me in. Dead deer I'm sure but NO blood and a broken off arrow.
Take another walk.Stinks being you right now doesn't it??