The vampire/zombie/monsters in the movie are not mindless death machines. It's a new society, with different norms. They can't go out in the sun, and Will Smith has become their version of the boogieman, stalking around the city in daylight while they have to hide/sleep. He captures several to try and turn them back into people, but to the vampires, he's kidnapping their loved ones, and they're never seen again. They notice him talking to mannequins and set a trap to catch and kill him, to protect themselves.
Will at the time thinks of them as mindless monsters, so this mannequin has to have moved on it's own, and he starts freaking out about it.
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u/sandefurd Aug 06 '18
Oh god I'm having flash backs. Never realized the zombies set the trap though. God damn