"She attacked and is getting away with it. She knows now she can do it again." He sounded tired--this is a game he played in the past and he does not want to begin it all over again. "And if she can, she will, and Horatio knows it. He'll try something--he can't stop himself, not when there's a tyrant abroad. And he'll fail."

Because Horatio couldn't kill in cold blood. He never could.