The first 2 pictures in the 9 shot grid show off our use of the shot-reverse-shot cameratechnique. This is effective because it not only switches the view around so that you geta different perspective and look on the situation, but it is also used to convey where the sense of interest is coming from. In this case it is from downstairs behind the door and so the shot-revers-shot helps emphasise this. It is common of the thriller genre because it is used to build tension. It does this by conveying where the danger is and bringing the audience close to it. Naturally, this makes the audience more edgy and provides another perspective into the developing narrative.
The combination of shots 2,3, and 4 show off a match on action sequence. This breaksdown a particularly tense moment in the film and enhances the tension even further by showing in minute detail the exact action taken and delaying the sense of relief. An example of this is the door handle opening. The effect of this is that the audiencecannot see what is happening and like typical thriller conventions; the story unfolds for both the main character and audience.
The 180 degree rule is in place in films so that the audience does not get confused and disorientated in the scene. Another effect is has is that it increases the intimacy between characters in the scene. For a thriller film this is important because it increases the tension between character and adds to the tone of the film. What it also does is focus in on what the characters are saying, which may be a part of the plot as the audience is unravelling the story with the character in the film.
In this first picture, the protagonist is slightly leaning past the camera and with a questioning look on his face. The effect of this is that the camera is almost teasing the audience and creates a spike of tension when the audience cannot see what the character is looking at. The lighting here also shows off his curiosity and background lighting showing off his isolated surroundings. This shot is very effective because it only shows a silhouette of the person. By restricting the view and characteristics of the person it makes them unidentifiable and so naturally to human instinct it sets a scarier tone. The final shot is a long shot descent down the stairs and follows in an over-the-shoulder position. Keeping with typical thriller conventions, this literally follows the character through the story. In terms of overall mise-en-scene, the lighting here conceals what is down the stairs which is a slightly scary prospect.