Supernatural. It's the same as the array on our walls...well, the one back in the old dorm. If something evil attacks you, it should repel it long enough for you to run away.

I'll give the others out to those in Phoenix who are going out exploring to...

[ she shrugs, a little helplessly because she can't even think of a good example of what they could look for to help Juzo and Hunter right now ]

He said his monster was dangerous. So it probably means it's less safe to go out now than it was the first night if we don't know who or how many people are being effected.