Analysis of introduction to saw 3

The introduction to saw 3 begins with a black background with non-diegetic sounds of people screaming at each other over slow scary music with movement sound effects and dripping taps etc. White writing slowly appears fading in and out and then the camera shot changes to the bloodstained floor where the only light is from a torch which is shining onto a gun - still playing slow music. The gun is an indexical signifier. A man who is lying on the floor rolls into the torch light and tries to grab the gun, he used his shoe to reach it and noticed it wasn't loaded. Up to this point in the introduction the camera shot has been at the same angle but zooms in/out and follows the light of the torch when the man grabs it to stand up. The colours have been dull and dark except the man's light blue t-shirt.