Preliminary Task #2 After Effects:
Ghost-Trail:
This after effect would work nicely to create a drugged feeling, reflecting how the main character feels during her experience.
Liquify & Face Distortions:
This after affect could be used at some point to distort either the background or face of the antagonist, just in a more eerie manner than in the video.
Drunken Effect:
This could be another potential effect which could be used to convey the drunken state of the protagonist.