Giant shadows. You can shoot at them, but they don't stop. The NPCs-- there are a lot of regular students around the school that aren't actually human. At some point, I don't know why, they started turning into huge shadows. They attack and if you get swallowed, you turn into one of those NPCs. I don't know how to get someone back from that and I might have to risk going back to that if I get back. Before I was here.. I think I got swallowed by a whole swarm of them. My memory's a little fuzzy since I'd lost consciousness there.