With its runtime about 20 minutes longer than the previous one, "The Tribes of Tatooine" was already shaping up to be quite the episode just given that information alone.
In the present day, Fennec Shand brings the assassin that she took hostage in the last episode back to their base in Jabba's Palace. Boba sits at his throne and questions him, asking about who sent him and what his orders were. When he refuses to speak, Fett drops him down below through the trap door, where it seems like the Rancor (which was killed by Luke Skywalker years before) is about to be let loose behind the door downstairs. However, as a way to stop this from happening, the assassin finally reveals that the Mayor is the one who sent him to kill Fett. As the door opens, nothing is behind it—the assassin was actually in no danger at all.
The crew heads over with the assassin to pay an impromptu and unwelcome visit to Mayor Mok Shaiz; he's of the Ithorian species and has an attached robot translate for him. When Shaiz clarifies that the assassin is part of the Order of the Night Wind, one of his henchmen immediately kills the assassin.