When Lucas had arrived at the Adams' mansion he had thought it was the bad luck that had driven him there but he now understood it wasn't luck but it was destiny. Lucas and Belle were destined to be with each other even afterlife and death. One wouldn't exist without another and if one existed, then the other would exist as a law of nature.
Though he had not seen the scene and had only heard it, he could tell that Greed had killed her mercilessly and then killed him.
"I love clues!" responded Greed with excitement, his eyes looking bright and staring down at Lucas.
"Who gives you orders to kill?"
"Hmm, that is no clue it is a question," said Greed, as he helped himself in sitting down on the branch on his heels, "You seem very curious about me and my work. The Thirteenth Grim who never shows himself, why?"
Lucas twirled his scythe that was in his hand that created wind in the atmosphere, "Your answer will give you the clues."