tormentor

noun

1. a person or thing that torments.
2. Theater. a curtain or framed structure behind the proscenium at both sides of the stage, for screening the wings from the audience.Compare teaser(def 2).

noun

1. a person or thing that torments
2. a curtain or movable piece of stage scenery at either side of the proscenium arch, used to mask lights or exits and entrances
3. films a panel of sound-insulating material placed outside the field of the camera to control the acoustics on the sound stage