When the woman at the subway station tried to help Christopher, what did he say and how did he react?

He ran away and said she might be calling the police.

Explanation:

This question is about "The Curious Incident of the Dog in the Night-Time" where Christopher decides to try to find out who killed his neighbor's dog, however, Christopher is a peculiar boy who shows very strange behavior, sometimes causing that many people do not want to help you in this investigation. He is so used to this hostile behavior by his neighbors that when a woman in the metro tries to help him, he suspects that she calls the police and ends up running away.