Fade in to a long shot of Emma at a bus stop after school (temporal+spatial shift) as the bus arrives. A montage engages as she enters the bus home and begins writing a song (a montage usually suggests a process/plan being prepared). Over this, continue the non-diegetic music "Neck of the Woods" from the beginning as a motif of a journey (specifically to and from school) for Emma in this episode.
Rick Meets Emma (Equilibrium)
Starting as a long shot of the room panning closer to the center of the stage, we witness Emma perform the song that she wrote in the previous key scene (diegetic sound as Emma plays Daydreams by Maisie Peters from the soundtrack). A large crowd forms and cheers her on, and we see some of the key characters in the audience. Proxemics is used to suggest alliance (for example, foreboding Hunter and Mabel's alliance as they are close, making us doubt his character)
The Murder (Disruption)
This narrative is a side-story, which is conventional of teen dramas to shine a light on people other than the main character and narrative. Usually, side stories branch into the main story as a series progresses.In this scene, a long shot pans into the jock characters bullying and ridiculing Hunter for attempting to organise a school-wide 'Queer Support Group' to help people (possibly like Beth) feel safe to open up.
The Final Scene (Disruption)
Rick introduces himself to Emma, in awe of her performance.The medium shot shows the close proxemics of Emma and Rick (the conventional, masculine character) implying a possible romance. We also see Mabel standing in between them and watching, and they don't notice, foreboding that she has an involvement in this. Next to Rick is his sister, Lacey. As it's slightly later, there are fewer people at school so the constant and regular 'bustle' of diegetic sound is not there.
Oli, a minor character from the third scene, is in the music closet as Mabel enters. Thinking she's alone, and admitting her evil plans to murder Emma by speaking to someone on the phone, Oli hides in fear and we see a shaky POV shot from his perspective. However, when Oli drops his violin and the violin bow, Mabel finds him. Quick-cutting into a long shot, we see as Mabel grabs the bow and instantly stabs Oli with it, murdering him.
After the murder, we see an eventual close-up of a proud Mabel as she walks towards the camera. This setting contrasts/ties in with the setting that Hunter was in before, yet now in darkness to connote evil. This is cross-cut with a second scene, Oli's friend Ethan finding his dead body, and screaming for a teacher - both in shock. This is played over the non-diegetic "Smile" by Maisie Peters which is contrapuntal to the scene on the right but very fitting with Mabel's scene on the left.