A shadow absolutely MUST be cast on something. A shadow does not just appear in the air. This 'object' moves from left to right and is not distorted at any point. It moves in front of the doorway at the far end of the corrider and at that particular point, I don't know what (if it was actually a shadow) it is being cast on. The only thing I could think os that could cause this effect would be if there was a sheet of glass at the end of the corridor. That could be used to create this effect in real time but I highly doubt it as we never see a reflection off the glass, and it would be far too sick of CNN to do that.
good points! that is not a shadow. since I don't believe in ghosts, I think it is a joke someone is playing on us. is it scary for you baby?