Gibbs: Things odd, Abby? What's odd?
Abby: The bullet that killed Midge. It's nasty. It's like way nastier than any standard .32 I've ever seen.
Gibbs: It looks pretty standard to me.
Abby: Yeah, but look closer. It's covered in mold spores, and old mold, like sixty years, which means it's a very old bullet.
Gibbs: From where?
Abby: Well, my first thought is this assassin from the past. He stumbles through a tear in the space-time continuum.
Gibbs: Or from somebody's old gun.
Abby: That was my second thought.

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