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Half-Life: Opposing Force Hints
Barnacles
Barnacles latch onto the ceilings of buildings and dangle their tongues down from above. The tongues will grab onto whatever happens to step into them. Once caught, the tongue is quickly retracted, elevating the victim to the barnacle's tooth-filled jaws.
You can usually just avoid the tongues if you see them. In OpForce, though, the developers made specific use of light and dark to help conceal the tongues of barnacles. Pay close attention to avoid being caught in them. If you are caught, switch to your knife and start slashing at the barnacle immediately, regardless of how far down you are. You want to hit the barnacle before it hits you.
