Any number of reasons.Just wondering why PR was out at night. Was he taxi driving.,.If that was the case I would have thought he would have been hanging around the Welly or other night clubs.
Was he kerb crawling.
Carrying out his hobby, going for takeaway, popping to a shop, coming home from work or the things you've mentioned,
I doubt he was curb crawling. The Red Light District is a totally different area of the city.