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The Orange Box: Half-Life 2: Episode Two Hints
Sentry Turret Tips
1 of 6: As you enter the building, do so cautiously so that the turret can't see you through the force field.
2 of 6: Go to the right of the force field to find an infinite ammo crate for frag grenades.
3 of 6: You can throw grenades through force fields, so go do so.
4 of 6: Quickly strafe to where you can toss a grenade at the turret through the force field, then get back to cover before it can shoot you.
5 of 6: Keep doing that until one of your grenades knocks it over.
6 of 6: Or if there are any explosive barrels left in the building across the street, you can throw one of those through the force field to quickly knock over the turret.