Abandoned House Exploration Shadow Figure On Second Floor

In this video a group of teenage boys enter an abandoned building in what appears to be in the middle of nowhere or on private property there is fallen supports and fabric at some point the camera person points the camera upwards to a room on the second floor mentioning the status of the room and a shadow figure passes by not noticing the explorers this however prompts them to evacuate from the building. It is possible the figure is residual as the figure doesn't notice the young men.