1) The document discusses the opening sequence's use of characterization, setting, genre, and narrative structure to develop conventions of the horror genre.
2) For characterization, a child was used as the main character to make the story more confusing and petrifying, playing with the subversion of children as innocent.
3) For setting, a house was used because audiences can relate to it and feel unsafe in their own homes, with the bathroom used as the murder scene to induce unease.
4) For genre, editing, camera work, sound design, and iconography like dark colors and weapons were employed to clearly establish the horror genre.
5) For narrative structure, the boy's possession