Where did those feet go?

A couple of weeks ago or so (and not on the day that it hit 17 degrees) as I was walking through the tunnel from Westmount Square to the metro, I glanced down to see a trail of wet footprints from someone walking barefoot. The trail kept up til almost the end where I was sure to see some homeless guy to explain it all. Yet the guy passed out in the corner was wearing shoes. It was not raining or snowing either. Where did the feet vanish to? We shall never know...