Hala Stealth Puzzle
Just right of the entrance to the central building in Hala is a gate guarded by two cameras.
Use a stealth character to approach the nearby button and activate it. This takes out one camera.
Follow the power wire to the roof of this section. There's a heat beam and a camera, and a port behind a force shield.
Use a shield character with the deflector pad to bounce the heat beam into the port- the pad is far enough from the camera that the force shield should be inactive.
Completing the circuit here deactivates the second camera below, allowing you to drop down and claim the brick.