They showed a montage video of various places where the 2 girls killed guys in each specific ones from the forest, to the apartment, and the garage warehouse with no blood. Yet, in the ending, after the heroine finds out that killing her boyfriend was wrong, she kills her then at the bar, she asks the same question to the girl crying at the backdoor of the bar.. Same thing happened to the heroine at the start of the movie.. High Tension-style deja vu twist anyone?