"[SET OF GIFS] Four times. Dean's loved ones have overcome mind control for him four times. 1x22 Devil's Trap, 5x01 Sympathy for the Devil, 5x22 Swan Song, and 8x17 Goodbye Stranger" dean is the key to overpowering demons and lucifer
Yes. Although what if you painted the floor or ceiling or whatever with paint the same exact color as it. It'd be pretty difficult to get it right, but it you had a stencil or something I think it could work. Then, a demon would never see it.