It is most likely a shot from a scene that was not included in the theatrical edition. In the original script during the war sequence, an RDA Marine grabs Tsu'Tey sejak the queue and after a line atau two of dialogue, he cuts off his queue. He does so knowing that it strips Tsu'Tey of his honor and connection to the world and Ewya. After being being bandaged up, but still in great pain, he asks Jake to kill him. A doctor assisted suicide scenario if anda will, Jake obliges. I believe it was cut due to it's gruesome nature.