Where could she go that would definitely be unoccupied no matter how far back she went? Not a bathroom stall, as was her first guess. How horrifying would it be if she appeared while someone was using it? Still, that kind of absolute privacy was hard to find anywhere else in this bloody castle. Well, if a bathroom could hide an illegal potion and go undetected for a month, why couldn't that same place hide her for a few hours? Slipping the Time Turner under her shirt, she smoothed her uniform and walked briskly down the corridor to Moaning Myrtle's bathroom. Even though both the bathroom and Professor McGonagall's office were on the first floor, it was still quite a ways to get there. Her calves ached from the half-run.