Furthermore, as Barney Calhoun mentioned, he barely saved Gordon from being sent to Nova Prospekt on a train. At the very beginning of Half-Life 2, this is evidenced when Gordon Freeman arrives at a security terminal and a Combine guard inspects several citizens and orders them to specific locations.
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It appears that the Citizens of City 17 have full knowledge and understanding about Stalkers, what they are, and how and where they are "made." Alyx Vance comments on Nova Prospekt: "It used to be a high-security prison, it's something.Contrarily, if the player is fast enough to cross a field bridge there before it deactivates, Stalkers can be approached face to face, and do not attack the player but instead walk away as if he weren't there at all. The Stalker will then proceed to attack the player with the laser tool. Interestingly enough, when the player is in the core of the Citadel and chooses to kill one of the two Stalkers, the remaining one will turn to face the player and roar at Freeman.
Alyx states that the Stalkers "shouldn't bother us if we leave them alone". After a bit of progress, the player and Alyx enter a room with two Stalkers working a Forcefield, temporarily preventing progress. In Episode One, the player and Alyx enter the Citadel.
A Stalker's limb extremities (hands and lower legs) have been removed and replaced with bolted-on metallic augmentations, which offer reduced agility and result in a slow, zombie-like gait. Barely recognizable as human, Stalkers have undergone drastic surgical procedures and synthetic implantation.