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Half-Life: Opposing Force Hints
Headcrabs
Headcrabs are little quadrupedal aliens that lunge at your head. If they were to succeed in killing you, they would tie into your brain and turn you into a zombie. Headcrabs are for the most part easy to kill. They mainly walk towards you and jump at you. Pull out your knife and carve them up before they hit you.
One way to kill headcrabs without using any ammo is to dodge when they leap at you, then quickly run up to them and whack them with the knife or wrench. They can't jump backwards or sideways, and it takes them awhile to turn in place and prepare for another jump.
