The effect of the acting adds to the shock and fear of the murder, Cranes shrieking screams itensify the murder and adds more fear to it then if it were just silent.
The camera angles are mainly ECUs of Crane getting stabbed, this adds meaning as it causes the audiance to visualize what is happening around marions body being stabbed and adds mystery and wonder of who is stabbing her, there is a graphic match of the shower drain and Cranes lifeless eye after she is just killed to show her life ebing sucked away.
Meaning is created through closed form as the scene offers many questions who killed Crane? all we have to see is a shadowy siloute in a dress, also the repeated slashes in ecus add more question as the audiance wonders what is happening in the film
Meaning is created through editing as the camera becomes the knife in ecus and with the use of sovite montage theory where images are presented not next to eachother but on top of eachother, the killing is thrown on to the audiance and has them use their imagination to put the missing pieces of the montage together in order to get the whole scene in their mind, and ultimatly adds more fear as the unknown is left for the audiance to interpret.
the black and white softens the gore and brutality of the murder  it also adds more question into who the killer really is because it vlocks out the color and only gives a shadowy figure
Through sound the meaning of fear is created as the repeated high pitches startle the audiance and adds to the initial fear and shock of the film