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Half-Life: Opposing Force Hints
Regular Zombies (Hybrids, Mawmen)
Regular zombies are the slow-moving products of successful headcrabs who have taken over their host's body. You may remember regular zombies from the original Half-Life, and you may remember that they aren't too difficult to beat. A few shots to the head and they are down. If they get close enough, they will slash at you with their powerful claws. Avoid this if possible.
To kill a zombie with the knife or wrench, walk up to him and whack him once and then back off quickly. If he starts his slow two-arm swing attack, move in as soon as he swings his second arm and get in two or three good whacks before retreating. If he uses his faster attack, you should only risk one hit after it.