When did John give his friend a cigarette?

John had bought a packet of cigarettes just before we caught the train and he offered me one as we settled ourselves in our compartment. We were on our way back from a camping holiday. We had lived rough for a fortnight and even a cigarette was a luxury at that moment. I felt in my pocket for a box of matches, but I couldn’t find any. "I haven’t got any, either, "said John. Sitting opposite to us was a man whose face was hidden by a newspaper. “Excuse me, Sir,” said John, leaning across, “could you give me a light, please?” The newspaper was lowered to reveal a rather elderly man with a stern face. "This is a non-smoking compartment, "the man said. He indicated the notice near the window. We apologised and put away our unlit cigarettes. The man went on in a rather more kindly fashion to warn us against the dangers of smoking. “I speak as a doctor,” He concluded. After that, he went back to reading his newspaper. When he got out a few stations later, he left his newspaper behind him. We picked it up, eager to find out what had happened while we were on holiday. “Just look at this,” remarked John, pointing to a photograph. “It’s the man who was sitting opposite us.” Underneath the photograph was an account of a lunatic who had recently escaped. It appeared that he liked to i0retend to be a doctor.