Contains spoilers for "NCIS: Origins" Season 2, Episode 5 — "Funny How Time Slips Away"

Mark Harmon's Leroy Jethro Gibbs famously has a long list of rules in "NCIS," and viewers discovered the reasoning behind one of them in a Season 2 episode of "NCIS: Origins," the prequel series that features a younger Gibbs played by Austin Stowell. "Funny How Time Slips Away" spotlights the creation of rule #11, which is: "When the job is done, walk away." It's a motto that Gibbs will come to live by and one he'll share with colleagues like Tony DiNozzo (Michael Weatherly) later on, but it sprang up from tragic circumstances.

In "Funny How Time Slips Away," Gibbs' close friend Mike Franks (played by Kyle Schmid in "NCIS: Origins") talks him into letting go of a dossier of pictures of victims that he

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