How does Christopher's reactions to riding to the police station differ from what you might expect?

We would expect Christopher to fall apart when he is arrested, but the arrest and subsequent ride to the station allow him to calm himself and pull himself together. Rather than be upset about the situation, Christopher can focus on the smells of 'hot plastic and aftershave and take-away chips' in the police car. As they drive Christopher watches the sky and sees the Milky Way. He explains what the Milky Way is and then explains why it is not light at night despite all the stars in the sky: the stars are all rushing away from one another as the universe expands and they will not rush towards earth until the universe stops expanding by which time humans will be long extinct.