There was supposed to be a cutscene [1] which played when you opened the door (similar to when you first encounter Lazarus), but it was apparently disabled. The video file was still left on the game disc.
And having the cutscene there would perhaps not have been as effective, as it would have removed the player from the "world" if only for a split second.
From the ouside you see a darkened room with some blobs that may be raw flesh inside. Open the door and you hear "ah, fresh meat" as a voiceover.
Right after that a big, bulky demon with a bloodstained apron and a meat cleaver walks into view.