Is there a possible way to debunk this?

(Warning: Be sure to turn off the volume in this video unless you want to hear painfully loud screaming and hissing and gurgling) So this youtube video has VHS footage where in some instances the camera display lists the footage as being from May 1995. It is footage of and allegedly demon-possessed woman at an Exorcism in South Africa. at 4;37 you see her seemingly levitating, with a sheet over her. If you mark the spot where the sheet is farthest from her head before the man pulls it back, then that should be the spot where her feet are. The man seems to pull the sheet down to her ankles (you can see what seems to be the shadow of her knee), and if you measure the spot where the blanket starts covering her instead of the black pants showing, and the distance between that and the farthest point where her feet could be as I mentioned before, it seems to be less than 3 inches. But if I'm wrong about where her feet were, and in reality her feet are on the mattress and they only pulled the blanket down to her knees, not her ankles, then you'd think there would be enough space in the blanket to cover her thick thighs, which are obviously more like 8 inches, not the less than three mentioned above.: https://www.youtube.com/watch?v=_L2b8XxTB00