Philippians 4:8 and Watching Violent Content
Philippians 4:8 gives no list of forbidden films and no acceptable level of bloodshed. It gives a positive command about what fills the mind, and that command shapes how a Christian should weigh a steady diet of violent images.
Philippians 4:8 and Drawing Demons
Philippians 4:8 does not mention drawing demons, so the honest answer comes from asking what the practice does to the mind. The command directs thought toward what is true, pure and lovely, and that is the standard to bring to the question.