Plot for opening scene

The scene starts off with the killer in an empty room with nothing but a TV where he he is watching a scrambled television. Beside the killer ice hockey mask which he uses to hide his identity. The victim comes through the door downstairs and calls his mums name asking if she's home. The killer goes slowly down the stairs. He watches the victim walk past into the kitchen area. The victim has a glass of water then goes to have a shower. The killer knocks on the front door then goes into one of the side rooms. The victim opens the door and steps out into the porch. The killer follows him then stabs him repeadetley.