It has a verb, yes, but there's no subject (the other necessary component of a clause). Who is bringing the equipment back?
This is an interesting example of a fragment because in another context it actually could be a complete sentence. Let's change the first line of dialogue:
"Go there and bring him back."
"And bring Pathfinder and Sojourner rover back with him," Mindy added.
Now it's a command, not a fragment, because of the way we interpret bring—Mindy is telling someone to bring the equipment back. (And remember that commands always have "you" as an implied subject.)
In the original, Mindy is giving information—the astronaut can bring the equipment back. It's a fragment because she doesn't include the 'subject' (the astronaut). The other speaker already established who they're talking about, so Mindy doesn't need to say it. This is very common in dialogue.