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The subject matter of this article contains in-development information that was cut from the final version of an official and/or canonical source and appears in no other canonical source. It may also contain incomplete information since not all cut material is publicly known.
Laser-firing Personality Construct
Reusing the model of GLaDOS' Curiosity Core, the Turret was to emit a laser similar to that of the Aperture Science Sentry Turret or the Rocket Turret, except that it was to be light blue in color and burn the player in a way similar to that of the Thermal Discouragement Beam. A pre-release screenshot depicts it dangling from a wire attached to the ceiling, which would explain its name.
Spawning the Turret in-game with the code "npc_hover_turret" will provide the "ERROR" model, as the model is missing from the files - only the blue laser is visible and effective, with a yellow sprite that lies where the "eye" would be found. The NPC is apparently fully functional: the laser will hurt the player, resulting in death if they do not move; the Turret will also follow the player when coming closer. It is however not affected by physics, since the "ERROR" model has no physics data; therefore it cannot be carried or sent through an Excursion Funnel, etc.
One of the cut Pneumatic Diversity Vent Passive Monitoring images was to be used for the Hover Turret, identified as a Personality Construct named "Lazer Turret", with the screen texture file named "vacum_scanner_tv_hover01.vtf".