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Half-Life 2 Hints
Ground Turret
Health: special (see below)
Attack Damage: 3 per bullet
First Seen: "Follow Freeman!", Section 3
These are fancy machine guns that pop up out of their little niches in the floor when hostile forces (you or your team) cross their blue laser alert beams. They can fire pretty fast, so always try to avoid getting hit by them at all.
They can only be destroyed by explosives, and the preferred method is to carefully roll a fragmentation grenade so that it falls down into their little niche while they're up and shooting. RPG rockets and SMG grenades are faster, but in shorter supply in the areas where you encounter ground turrets.
TIP: Turrets have a limited range of rotation, so always look for opportunities to roll a grenade in while standing nearby in a safe spot.