"But this is terrible!" cried Frodo. "Far worse than the worst that I imagined from your hints and warnings. O Gandalf, best of friends, what am I to do? For now I am really afraid. What am I to do? What a pity that Bilbo did not stab that vile creature, when he had a chance!"
"Pity? It was Pity that stayed his hand. Pity, and Mercy: not to strike without need."