Opossum
Don't trust the looks of these Necromorphs. If there's one laying on the ground, put a bullet in it's back. Don't get close to those things, because they all have a nasty habit of playing opossum.
If you get close enough to one that's playing opossum, you're most likely going to get a good scare and torn to pieces. Don't fall for it. Bullet is worth less than the med pack it's going to take to heal your wounds.
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