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Half-Life 2: Episode One Hints
Barnacle and Headcrab Tips
1 of 4: The headcrabs are all hanging onto the ceiling right next to the barnacles.
2 of 4: If you didn't use the gas canister or explosive barrel that are near the power-lock door on the zombines, toss each one at a barnacle without getting too close so that the nearby headcrab will catch fire and die.
3 of 4: Otherwise, keep an eye (and a flashlight beam) on the headcrabs as they drop down and run around so you can avoid them while Alyx shoots them.
4 of 4: Then shine your flashlight on the barnacles so Alyx can shoot them, too.
