Subway Nightmare

Nignhtmares, you probably have your own. It might be about a serial killer chasing you or you are being attacked by a group of spiders. Some people's nightmare turn into reality and to some it stays as a wicked fantasy. Usually we don't know what are the things lurking in the mind of others. You might not know the person next to you is hiding a bomb and eventually explode the place.
This story circulates on two sisters named Emily and Monica as they witness their own nightmare.