(Franchesca dialed the number of the police station near their house)

The police station received Franchesca's call before the killer got into their house.

About the mystery caller who called Atty. Galiego at 11:42pm, He is the police on duty the moment Franchesca called to their station and asked them to help her. He wasn't able to complete the call when he had to go to the comfort room because of stomachache. So, he needs to end the call because he was the only police that time ...