Sentinel robots

Sentinels are hover robots that shoot orange glowing rectangles similar to those of S.W.A.T. Units. They have a green laser in front of them and only fire when you enter the laser. Takeshi can stealth to avoid them. Sentinels are shielded until they fire. They are extremely tough to destroy. Later in the game, they start shooting three flaming bullets that are faster and sometimes chase you. Even later, they are upgraded to Upgraded Security Robots.