Friendship ended with the Shadow Walkers, Time Walkers are my new best friends. Edit: What is a Time walker or Shadow walker? npc_shadow_walker is an unused NPC in EZ2, it is on the Shadow Walker map pack made by 1upD that can be found on the workshop. The Time Walker is the temporal variant and the best way I found to implement this NPC in the game ambient. Walking corpses (without a headcrab) seemed like something the temporal anomalies could do. They wear Borealis Workers uniforms but with Aperture logo and color scheme.
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They look cool