|“||Never show mercy.||„|
|~ The Dai Li sergeant forcefully training Kai|
The Dai Li Sergeant was a high-ranking official in the Dai Li, the elite police force of Ba Sing Se. He was in charge of training the kidnapped airbenders into Earth Queen Hou-Ting's army as part of the first airbending regiment.
The Sergeant was particularly disgusted with Kai for showing compassion for others and for defending them against the Sergeant's ruthless exercises. After beating Kai up, he has him locked away in solitary confinement.
Later when Team Avatar goes to bust out the airbenders, Bolin, Mako, and Jinora free Kai, but are stopped by the Sergeant and two other Dai Li agents, reiterating that abandoning the Earth Queen's army was treason and punishable by death. While the other two agents were taken out easily, the Sergeant nabbed Jinora, prompting an enraged Kai to incapacitate the Sergeant with a strong gust of wind.