Psycho shower scene

Today in media we had to look at the famous shower scene.We had to look at creation of suspense,use of music,camera work and editing.
There was around about 42 uses of editing, the edits start off slow then start to get faster as the music starts.
At the begining there is deigetic and non-deigetic sounds there is deigetic sound at the begining of the scene when she walks into the bathroom the non-deigetic sounds comes when the killer opens the shower curtain.
There isnt many uses if camera there is mostly editing, the camera zooms in on the killer when he walks into the room. The next big use of camera was when the camera does an extreme zoom into the plug hole then zooms out of the dead womens eye.