It made me uneasy, but other things that evening were taking priority on my list of concerns, so I ignored it. I had no paint, but dribbled my fingers in the sharp sense of that place and, in the middle of the tunnel, started to draw my own mark on the wall, feeling even that slight movement give me comfort as I made the long shape of the protection symbol, my own ward against evil and harm. Not quite a guard dog; but close enough.