This happens when the City Scanner is injured.
When a City Scanner is "pissed" (as stated by Gabe Newell in Half-Life 2: Raising the Bar), their "pupil" contracts. Scanners are not directly met in Episode Two they are only seen on the route to White Forest. In the Half-Life 2 chapters Anticitizen One and "Follow Freeman!", the npc_create npc_cscanner console code spawns a Shield Scanner. Spoken by a robotic female voice, they include sentences such as "Citizen, do not move.", "You may proceed.", "Hold still for scan.", "Hands on your head." or "Violation has been noted.". 
11 sound files found in the playable Half-Life 2 Beta files also indicate that the mechanical Scanner was to talk directly to people via prerecorded messages. 
The mechanical Scanner design was initially modeled after the shape and movement of a piranha. As the Combot, the mechanical Scanner was to throw gas from its front, and fire from the small ergots on its two sides. While the City Scanner started as a Synth under several variations that made their way into the Shield Scanner, Ted Backman, and Dhabih Eng both worked on the Scanners concepts the first ended up with the Synth version, the second the mechanical one, first known as " Combot". Interestingly, it appears that parts from a salvaged City Scanner were used in one of the more recent additions to Dog both machines have a similar frontal design, though Dog's face possesses three face plates while Scanners have four. During emergencies, Scanners can be mass-deployed in thousands from the Citadel, to perform a city-wide, and possibly out-of-city search such as when Gordon Freeman was detected in City 17. Scanners help by locating targets and alerting other nearby Combine units. Other applications include reconnaissance and searching for wanted individuals. They are commonly seen patrolling City 17's Canals, searching for refugees. A critically damaged scanner will usually attempt to kamikaze dive into its attacker, while spinning and emitting an alarm.Īs the name implies, Scanners are generally used only in cities and are rarely encountered anywhere else. 
Scanners are lightly armored and can be destroyed easily by gunfire, impacting against walls or being hit by objects. Scanners are powered by a single Combine battery, which can occasionally be salvaged from a destroyed unit and reused for the HEV Suit. The scanner also has a spotlight mounted on its top, which is used for illumination and can move independently from its source. The flash emitted when taking an image can temporarily blind a person, even when not looking directly at the flash. Scanners are equipped with a searchlight and a camera used to take photographic images.
City Scanner using its searchlight on the Trainstation Plaza.
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