Trivia: Stan Lee does his Marvel cameo and can be seen taking Chadwick Boseman's winnings/chips at the casino saying "I will take these!"
Trivia: The way Black Panther takes down the rhino is exactly the same way he does in the comics.
Trivia: During the first few days of filming on the waterfall set, many of the actors and extras began to have difficulty keeping their eyes open, and began experiencing pain, irritation and discomfort. The crew at first suspected there was too much chlorine being used in the water, but they eventually realised what was actually going on... it was so bright on set due to light reflecting off the water, everyone's eyeballs were getting sunburned. The studio then had to buy sunglasses for everyone to wear in-between shots.
Trivia: Michael B. Jordan kept to himself during filming, to reflect Killmonger's relationship with the other characters.
Trivia: Wakanda is shown on the map as where Southern Sudan is.
Trivia: This film sees Michael B. Jordan on a similar trajectory to Chris Evans. Both actors previously portrayed the Human Torch in much maligned Fantastic Four films, only to get redemption from fans and critics in the superhero genre as a whole for their roles in the Marvel Cinematic Universe.
Trivia: This was the first comic book and superhero film to be nominated for the Academy Award for Best Picture.
Trivia: Wesley Snipes attempted to get a "Black Panther" movie made in the 90's. After issues finding a director and suitable script, as well as facing other hurdles with effects and costume design, he abandoned the project, and eventually pursued another Marvel character - Blade, which ended up turning into a popular film trilogy.
Trivia: "Wakanda" comes from the Kenyan Wakamba (or Kamba) tribe.
Answer: Zuri feels guilty for his role in the death of Killmonger's father, which is why he tells Killmonger to kill him instead of T'Challa. While Zuri himself probably doesn't actually want to die, I don't think he wants Killmonger dead either, which is why he wouldn't kill him. Also, as a royal advisor, it would probably be looked down upon by the other tribes if he violated the rules of the ritual combat. After all, one combatant has to defeat the other in order to rightfully claim the throne.
Phaneron ★
Zuri may not want Killmonger to die, but he knew that the duel would only end once one of the contestants would either surrender or die, meaning Killmonger would stil win or kill T'Challa. It seems a rather low price to be looked down upon or fired if it means your country doesn't go to war. At least, that would be a small price to pay for keeping the peace.