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Half-Life Hints
Barnacles
Barnacles are the quiet killers. They attach themselves above any route of travel, be it room or cavern. A long grey tongue hangs down from their toothed jaws. If an unsuspecting victim stumbles into one of their tongues, the tongue latches on and drags the victim up and into the jaws of the barnacle. One or two shotgun blasts to the mouth will kill a barnacle. The tongue does not pose a threat after the barnacle is dead.
If you do get caught in a barnacle's tongue, try to free yourself before you get pulled up too high. If you do reach the jaws of the barnacle, switch to the crowbar and start beating the barnacle until he lets go. Hopefully you will survive the fall. (Remember that falling any distance into any amount of water never hurts you.)