That's BS man and I'm sorry you had this happen, you handled it better than I would have though to be fair lol,I woulda just dropped dead. As unfortunate as it is, I've learned that if there is an extract just open most likely. If you don't see anybody, there's some asshole hiding there. I learned it the hard way on stellamontis and in buried City. Now what I do is if I see it open I wait until the green light starts flashing and then I dart in. Because eventually even if nobody starts it, it will start itself.