 As shown beneath the closing credits, Maggie Cheung (qv) suffered  a major head injury while trying to outrun the falling metal frames.  Cheung was unable to finish the film after this incident, so you  never see her face; she is always shown from a distance.  Crystal Kwok (qv), who plays a policewoman in the film, filled in  as Cheungs double for the remainder of the film.