Do nothing for now
From Create Your Own Story
During your time in the sewer you continue to observe the vagrants from a distance, always making sure to avoid being seen. One day while searching through garbage, looking for rats to eat you feel a tremor, a small earthquake. A loud crash, followed by a scream of pain gets your attention. Running to the noise you see that several pieces of the concrete have fallen from the ceiling, trapping the legs of one of the vagrants, a young woman. She sees you, despite your effort to conceal yourself and she calls to you for help.
What do you do?