Dollars to donuts this is an enveloping problem within a dynamically generated photorealistic mesh driven by a performance capture system designed to re-create anyone visually with an augmented voice generator and what we see here is the lighting in the area of the eye lid losing its enveloping to the mesh. As the lighting value flickers slightly and loses its lock for a fraction of a second, the system corrects moments later and rebuilds a motion path to correct for the loss of cohesion. I would say this is not Assange at all but a 3d recreation of him played by an actor and the voice is dynamically rebuilt using samples rendering a nearly indistinguishable from reality 3d model.

I would venture to say, Assange may be dead already. Either this or he is a shapeshifter. Lol.