You were dragged along with a girl you found in the woods. She claims to be just an urban explorer, although you had the feeling there was more to it. She lead you to an abandoned school in the middle of the night. She told you her name is "Delta," although that could be a lie. She informed you that there are creatures in and around the school...

the two of you are still in the car, and just as you are about to get out, Delta stops you

Delta: Wait a bit. We need to be sure we are completely alone before getting out.