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Half-Life Hints
Alien Slaves (Vortigaunts)
Alien slaves are the first real bipedal opponents. They are the first to act in true squads and are the first to really try to outsmart you. They will run away from weapon fire, they will hide behind doorways and in shadows, they will try and draw you into traps, and they will search for you.
They can fight hand-to-hand with a powerful slashing attack, and they have a very powerful electrical discharge that can quickly cut your health and armor down. The electrical bolt that they fire requires them to conjure up enough power before firing. Be sure to target whichever alien slave is furthest into his power-up. One or two shotgun blasts will usually take care of an alien slave.
A note for Difficult-level players is that the slaves' power-up time is cut in half, allowing them to fire much faster.