According to Gibbs’ (Mark Harmon) Rule 91, “when you decide to walk away, don’t look back.” And by the end of the NCIS Season 18 finale, someone does just that. The episode has somewhat of ...

Rather than follow his orders, she heads to see Gibbs, who’s painting “Rule 91” on his boat. It’s “the one that comes after 90,” is all he offers when she asks about it.

And so Gibbs paints Rule 91 on it. When Bishop stops by to talk to him after Vance sends her home early on, she admits she’s mad at Gibbs because “we’re supposed to be a team, and you have ...