Leave the room.

From Create Your Own Story

As you cheerfully exit the room, you feel an unbearable stinging on your back. You reach to feel what it is, but nothing's there, so you continue on with your search and you look around carefully at everything you pass, for anything you might be able to use as an escape. There isn't anything here other than blood and walls. The stinging you felt is getting worse. so... you decide to:

Go back to the room, and rest for a moment, or at least until your back stops hurting.

sit down on the floor where you are.

ignore it, there are more important things going on right now.