WHY IS UT SO SHORT NO PLS OMG IM LOOSING IT I NEED TO KNOW WHAT MADE HIM SCHOK LIKE THAT

Because he thought that once he is done with him, he will feel better. He himself doesn't know why he feels way worse now. It's like acting in a rage then realize that you shouldn't have done that. That's the shock he is feeling right now and he cannot comprehend why is he regretting it. It's a first for him.