( warn represent spoiler . ) five young people ignore the warning of forest ranger george kennedy and hike up to the misty oregon mountain where they be stalk and butcher by a pair of huge and deformed and in breed hillbilly twin . when only two be leave and warren and his girl connie and they resort back to their animal instinct to stay alive . the film end with connie shove half of her arm down one of the killer throat and choke him to death . a very powerful and if somewhat overrated and backwoods slasher flick thats effective use of lighting and sound and photography make it a cut above the usual friday the 13th cash in . lead by an attractive and likeable cast and especially deborah benson ( where be she now . ) and gregg henry and this nifty companion piece to director jeff lieberman squirm ( 1976 ) and blue sunshine ( 1977 ) shouldn not be miss .