Someone recently posted a clear screencap of the monster that grabs Vincent in the trailer, which raises a few questions. The monster apparently is referenced in an x-ray seen in the nurse clip, and may or may not be missing part of its head. I think that this may be the "brain monster" Bassett talked about. It may also be Leonard, though I think the cloth on its shoulder is much thinner than the type Leonard is seen wearing. If it's not Leonard, I wonder what symbolism it carries in reference to Heather? Perhaps it symbolizes the half-brained and demonic nature of the cultists.