The final shot of the film pans across four colored motorcycles with similar license plates. These directly refer to the Four Horsemen of the Apocalypse. For example, the maroon bike & plate reads "REV 634," corresponding to Revelations 6:3-4 when War is unleashed riding a fiery red horse.
Based on her closing speech, fighting ability, violent impulses, and red leather jacket, it is heavily implied that Lacey is this horseman... and with the arrival of the remaining three, the Apocalypse has begun.
Based on her closing speech, fighting ability, violent impulses, and red leather jacket, it is heavily implied that Lacey is this horseman... and with the arrival of the remaining three, the Apocalypse has begun.