I saw a film in the early 90’s , I only remember the final scene , if i remember correctly it was in a house with a large hall. In this final scene all was quiet and from under the floorboards a witch/demon burst through as the floorboards dispersed in a wave like fashion. I don’t believe there was any other demon/witch throughout the film , though its existence may have been implied so it was quite an unexpected ending.  it could have been a tv movie , i saw it early 90’s.