| || Well, that's not its name ... but ...
The term "Smoke grenade" has not been confirmed by official sources.
When Korra and Mako were trying to find Bolin at the Triple Threat Triad's headquarters, they discovered that he had been kidnapped by Equalists and promptly gave pursuit as the chi blockers rode away. Two Equalists on motorcycles deployed a pair of smoke grenades to obscure their escape. However, Korra and Mako quickly overcame the effects of the smoke and gave chase on Naga, eventually fighting two of the Equalists head-on. The chi blockers prevailed and were approaching the two immobilized benders with bolas when Naga gnawed through her ropes and attacked. The Equalists quickly retreated, covering their escape once more with smoke grenades.
Several days later, when Councilman Tarrlok led a task force into an underground base where chi blockers honed their skills, one trainee released a pair of smoke grenades, but Korra quickly reacted and froze the grenades with her waterbending, effectively sealing them before they could release their full contents.
The smoke is harmless, and although it creates effective cover, the concealing effects do not last long. The grenade can be rendered useless by preventing it from releasing smoke, for example, by using waterbending to freeze the canister and thus seal it. Being smoke, it can simply be blown away by a gust of wind, making them useless against an airbender.
- ↑ 1.0 1.1 "The Revelation". Michael Dante DiMartino, Bryan Konietzko (writers) & Joaquim Dos Santos, Ki Hyun Ryu (directors). The Legend of Korra. Nickelodeon. April 21, 2012. No. 3, Book One: Air
- ↑ 2.0 2.1 "The Voice in the Night". Michael Dante DiMartino, Bryan Konietzko (writers) & Joaquim Dos Santos, Ki Hyun Ryu (directors). The Legend of Korra. Nickelodeon. April 28, 2012. No. 4, Book One: Air