"Uhm, but, you really shouldn't use oils for lubricating locks," murmured Nina as she obligingly stumbled inside Shae's apartment; his touch on her back oddly startling. "Even gun oil, they get gummed up with dust and stuff. You don't clean your lock after every use, which I hope you do with your guns, and which is why powdered graphite's better." Nina knew she sounded pedantic, but the thought of using gun oil on any part of a door simply alarmed her.