Grant never failed to assassinate anybody. However, he could never get himself to pull the trigger when he aimed at you. He was supposed to be your assassin, but he ended up being your bodyguard. When he was on a rooftop watching you, he started to get overly jealous due to a guy staring at you. You were Grant's only, if you knew it or not. You were partying, and had no idea that the man flirting with you was about to get shot, the red dot focused on his chest.