Creating Script and Mise-en-scene

I have decided to make a more mature video this time than the practice video we did with the bully. Therefore I came up with characters that have a proper background and did not just come into existence without much thought like in our previous video.
The scene is about a mentally ill (possibly psychopathic) character who has committed two murders and has been restrained in a secluded cell. The doctors are trying hard to breakthrough to him but have had a little success. At first sight, he seems to be a calm and normal person but he has forgotten a lot of the common things for example where he lived, who his parents were and even his name. He remembers the crime he has committed but the court can not execute him for the crime since his lawyer argues that he is mentally ill and did not commit the crime deliberately, in cold blood. The mentally ill character was shot in the leg before he was caught, so he limps as well.
The second character is an interrogator who is investigating this case. He failed to found out anything in his previous interviews with the subject so now he is conducting the interview in a different way, in the hope of knowing about whatever memory is left in psychopath's mind. He deliberately calls the psychopath 'Rick' (which is not his actual name but he has accepted it as his name). He asks 'Rick' who Bob Marlin is and whether 'Rick has any information about him. At the end of the video it is revealed that 'Rick' is Bob Marlin himself.
After I was done with the script, we arranged for props and stuff that would be required to make up the mise-en-scene with the appearance of the characters and the interrogation room. The clothes assigned to the psychopath was a grey shirt with black sleeves to make up the uniform of a prisoner and covered his hands, feet and face with dust to add the detail untidiness to his character. We assigned a formal shirt with a waistcoat vest for the interrogator so that he looks like a professional sort.
We had to film the scene in our school during the daytime, so we had to black out a classroom by covering windows with black chart papers. The light was provided by a torch which hangs directly above the table where the two characters sit so it looks more like an interrogation room.
There is a file that the interrogator takes out from a drawer in the table, which contains a profile on Bob Marlin. This is how we reveal that the psychopath is Bob Marlin.