The video quality is very poor, and I too think that the use of lights in the room and the location of some of the crew were crucial to the "Unknown Source" of the shadow. You cannot determine its source, way too many variables involved.

i agree...its to lit of a room to be conclusive.

i agree...its to lit of a room to be conclusive.

It seems like there are too many flashlights in the room to call it conclusive. It could be someone raising their hand and bringing it down in front of a flashlight, or maybe the shadow of a rafter or beam.