"Horror is a film genre seeking to elicit a negative emotional reaction from viewers by playing on the audience's primal fears. Horror films often feature scenes that startle the viewer; the macabre and the supernatural are frequent themes. Thus they may overlap with the fantasy,supernatural, and thriller genres
"Action film is a film genre in which one or more heroes are thrust into a series of challenges that require physical feats, extended fights and frenetic chases. It tends to feature a resourceful character struggling against incredible odds, which may involve life-threatening situations, an evil villain, and/or being pursued, with victory achieved at the end after difficult physical efforts and violence."
Currently, I think we will cover the horror aspect of the film very well in the opening sequence. However, I don't think the action aspect of film has been covered in the opening sequence. Therefore, we will have to think of more ideas that will cover both genre of the movie.