Those are the size comparisons more or less for the demon. And what it's face looked like.
I found him walking around some sort of barracks/watch tower thing on route the "church up high" the NPC told me about, right after the crow picks you up from the Undead Asylum.
He was facing away from me, and I backstabbed him, but I barely scratched him. He turned around and promptly one shotted me for my insolence.
What the hell is this thing? Am I in the right place, progression wise for an enemy to one shot me so easily? I didn't even scratch it!