You raise your clawed gauntlet and listen once more. The others take this as a cue to draw and ready their weapons as well.

You can hear it, louder than before. It sounds like the hum of a circuit breaker being strained, occasionally followed by a buzz, like electricity arcing. You can’t decide if it’s further ahead or behind. It seems to be coming from the other side of the wall. If the map can be trusted, that’s the curved hallway that may or may not really curve the length of the building. In retrospect, you never checked.

Just as you’re about to make a decision, you notice something. It’s getting louder, and it’s location is slowly shifting.

It’s moving.