I think there's the hint of some eroticism here. The victim mentions that she is about to take a bath, and he was delivering (if I recall) her bath salts from the pharmacy. Shows of femininity in any context, particularly erotic ones, are triggers for the killer. Its possible that he wanted to catch her while she was in the bath, not before.
A lot of Lang's later films focus on the exploitation of women by unsympathetic male characters. In While the City Sleeps, this operates on several levels: Mildred's only way to advance in the male-dominated news industry is to expose herself as a sex object. Similarly, Kyne's wife, who is actually called Lady Macbeth at some point, tries to gain influence through sex. Edward, who spends a good deal of the film essentially begging for Sally to sleep with him (and I think its hinted that he proposes to her with this specific goal in mind) almost instantaneously gives his new bride-to-be over as bait for a serial killer, for the advancement of his career.
Parallels between Edward and the killer are drawn frequently. For instance, its Edward that later uses the button lock to intrude on Sally. Sally, later in the film, explicitly draws a comparison between the two. Lang is fairly blunt in his contempt for Edward, and the men in this film in general.
Anyway, I suppose the point is that nothing is quite so simple in a Lang film. A seemingly nonsensical detail, such as the killer using the button lock, can reveal a rich tapestry of perversion!
reply
share