Re: Scariest Episode of TNG
I think that's just a mold of his face. It's not like it actually moves, it's like a plastic shape of his face that's being rotated under the ick.
According to Frakes, he was actually pulled into that muck.
"...the most elementary and valuable statement in science, the beginning of wisdom, is I do not know." - Lt. Commander Data, "Where Silence Has Lease"