A woman caught in this footage appears to be in a trance from the drums and chants of the people, or is she posessed, then she started wriglling on the ground trying to do this crazy dance or something.
And a man did the same thing the woman was doing as seen on the video, the pair wildly jerking and twisting on the ground. Apparently this is a ritual performed by the locals, to drive out the demons that are posessing the two.
Apparently the exorcism seems to fail as the pair continued flailing all over the ground. The demons that posessed them seems to be winning the struggle since halfway through the video the guy tries to break his own neck.
At the end of the footage blood is dripping from the woman's mouth, in attempt to bite her own tongue, this demons are crazy or is it the effect of drugs perhaps?. Watch and you decide.