"Ready?" Harry nodded cautiously, and together they advanced again, both of them casting detecting spell after revealing spell after neutralising spell, working through every one they knew as they approach the stairs. The place appeared clean. Draco held Harry back with a palm to his chest, "I’ll go first," he insisted, "I’m not coming to get you from the sixteenth century," he added. Harry acquiesced - he couldn’t help but agree that he was the one most likely to inadvertently trigger some kind of time booby trap.