The Ghost part 11(another ghost)

If you happened to see a ghost how could you be sure it was a ghost? Other than approaching the ghost and asking, quite politely, 'are you a ghost?' If you let that ghost walk by then you could never know for sure. If you were to ask someone you thought was a ghost if they were a ghost, and they weren't, what expression would that person take? I see lots of people close to death, but today I watched a ghost cross from the County Arcade to the Thorton Arcade. The clue that led me to believe this man was a ghost was the locomotion employed to cross the distance of those 30/40 feet and his pale and shadowy persona. I am looking at other people in the same space, but they don't maintain that same corpse distinction. The greyness and the physically tinged aspect.