1) Hector has been following a girl who is a drug dealer and addict. He witnessed her dealing drugs and taking pills, and saw her rob a client after he attacked her.
2) Hector decides he wants out and disconnects his phone so he can no longer be involved. However, when there is a knock at the door, he discovers it is the girl, who reveals she has a knife.
3) The document is the script of a short film that leaves the confrontation at Hector's door as a cliffhanger, suggesting further escalation of the sinister situation between Hector and the girl.