what is the name of the late 80's early 90's movie where black man gets

[Faith]

impaled in the chest? monster has mis shaped head and he also has a twin brother thats human and he only hunts in the dark and people was using a flare gun as light to find him......there was also a scene in the movie where it twisted some guys head completely off his shoulders.....also the monster could be mistaken for some sort of sci-fi were wolf