David George

Several times I've only seen the ending of this movie. A man goes to an abandoned construction site at night to rescue a woman and her son who have been abducted. When he gets there, he sees little robotic machines. The kidnapper tells him that the machines won't attack him and he goes to the top of the site. When he gets up there and confronts the kidnapper, he's told that the machines will attack and kill the first person that appears on the ground floor. A fight ensues and the kidnapper gets knocked to ground level and is killed by his own machines.