Sierra sighed, noticing the now-useless firearm. She rubbed her forehead with her non-knifed hand. "Perhaps if you could have kept it stored better." she shook her head. "Well, little boy." she winked at Sean. "Keep the little girl safe. I expect to see you both alive in a while." she said, nodding toward the out-of-place register and alcoholic beverage shelves. "Tunnel behind there. Use the minecart. Don't go any further than the first checkpoint."