In Bloody Bay, some happless new longbow recruits must have crawled inside the outer walls of the #3 hospital and found it difficult to get out. I know something is in there because I can see the defense buffs circling them, I think I saw part of one of them and presume them to be wall mounted pop-up anti personell turrets. So maybe this is less of a hiding staff thing and more of a "witless wonder maintenance worker installed them in the wall backwards" situation.
Please take a look at changing their placement in the image. might be handy for a GM to go there in game and attempt to move them first.