On any version of Aliens, fast forward the video to where the marines are listening to Gorman, as he gives them their orders right before they go to Acheron. He is interrupted by Vasquez, and she says "I only need to know one thing...where they are." In the background you can see Michael Biehn finish her line, "where they are" and look proudly around. Maybe Hicks' character has a tendency to finish other people's lines, but I think Mr. Biehn didn't know the camera would catch him saying Vasquez's line.