This scene. Dean is stuck inside his head with a construct of Benny and the only way out is for Dean to kill the Benny-construct. But look at his hand, the way his fingers grip fake Benny. This isn’t real, it’s not really Benny, but Dean feels it like it is anyway. Because Dean did kill Benny, to save Sam two years ago. Look at the way his hand curls in fake Benny’s coat. It still hurts so much.