1.1The Pity of Bilbo
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In the dark under the mountains, decades before the story begins, Bilbo has the monster at his mercy and does not strike. Gandalf later calls that restraint the hinge of everything: the pity of Bilbo may rule the fate of many. It looks like a throwaway kindness. It turns out to be the load bearing beam of the entire war, because at the Crack of Doom, when every strong thing has failed, it is the spared creature who finishes what no hero could.
The film plants mercy in act one and pays it off three movies later. Heaven has been running that play far longer.
The mercy that looks like weakness early in the story becomes the thing that saves the world at the end of it. Grace gets planted long before it gets harvested, so sow it even when it looks foolish.