He doesn't look too upset; I think he's waiting for his reward.
One day I heard a screech from my backyard and went out to investigate. Between the branches and leaves of my cedar and dogwood trees I saw a cat and it had some creature dangling from its mouth; I thought it was a large rat. As I approached, the cat dropped its prey and went under a tree. Moving closer, I saw that the dead creature was a small bunny. Our neighborhood is overrun with rabbits (more accurately, wild hares). Satisfied, and sensing the cat was watching to see if I'd steal its kill, I turned and went inside. A few minutes later I noticed the cat had retrieved the dead bunny; I'd like to think the cat respected me for leaving its kill alone.