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npc_hover_turret is a point entity available in .
The Hover Turret is an enemy cut from Portal 2. It was supposed to look like the 4 cores from Portal 1, but has no in-game model. The coded model name is "models/npcs/hover_turret.mdl".
The Hover Turret will fire a laser similar to the thermal discouragement beam at the player if it sees them. When searching for the player, it will glow blue, whereas when firing at the player, it will glow yellow. If the turret has a model with physics applied to it, it will also glow purple when being held, and will glow red on occasion when bumped into.