Booby trap

Description
To protect their secrets and their existence, the Sun Warriors installed booby traps around the perimeter of their city. A tripwire triggers one of the booby traps. If an intruder steps on the tripwire, the floor drops away, revealing a deadly row of sharp, wooden spikes. In "The Firebending Masters", Aang activated one of these traps, avoiding it with the use of Airbending to avoid falling onto the spikes. Zuko overcame this trap by building up enough momentum to run along the walls near the trap.