Scene / Seen (Thirty One Days of Halloween) --- The Unexplained

This is one I've posted before, but still remains to be explained.  It's a shot I took on a ghost tour. The photo was taken without a flash.  All the others came back dark, dark and dark.  I had the camera pointed in one direction, as there were people beside me.  We were in an old church in Quebec City, where people from a cholera epidemic had died.  There were reports in the church of people seeing a woman.