Yeah no kiddin'. Why didn't he shoot him in the head. No, he wounds him then gets into a tussle that wastes precious seconds then he watches his buddy get eaten allive. Geez.
Who's writing this season's scripts anyway.
It added to the back stabbery to see Otis eaten alive. Shane might have thought the Walkers might have moved on if it wasn't a live victim. Notice all the bodies on the highway that the Walkers didn't touch. I think they just opened up Shane's character as a ruthless selft-preservationalist.