Shadow Figure Captured in Photo

We recently took a trip to Michigan. We spent a day or so of that trip at Lake Huron. The scenery was nothing short of amazing.

Late of the evening, it was basically dark or dusty dark, so we decided to walk down to the docks and take some night videos and pictures.

In one set of photos, there appears to be a shadowy figure on top of the building. I'm not sure what it is, if anything. I made a short video showing the pictures and the figure. 

Here it is