In the final fight sequence with Arnie and the Predator. Arnie climbing up out of the water and just as he is climbing over the log the predator pins Arnie's head down on the log with the forearm blades. In early parts of the movie those blades are about four inches or so apart. When the Predator uses them to pin arnie's head down they are noticibly wider. Wide enough to go on each side of Arnie thick muscular neck. You can see how they curve outward in that scene and that scene only.