The urinal was installed only half public facing. But it was a bad part of town, and vandals got through the locked maintenance door next to the urinals, giving them free access to use and vandalise it from both sides of the wall while it was helpless. A
Publicly punished for her heretical crimes, Yennefer vowed to get revenge on everyone that took advantage of her... if she's ever able to be freed again. (Sabu)