Rincewind had left the hospital slightly dejected but happy to have something to do and somewhere to go every day. Plus, he had these scrub things!
The Luggage toddled along behind him, opening and shutting its lid to take in the scent of this new City. Since nothing was actively trying to kill Rincewind right now, it was fairly calm and, while not innocuous, at least not overtly threatening.
He had no real goal in mind, just finding somewhere to live and someone to talk to who would hate him or ask him to save their small town from imminent doom. So he was very surprised when he came upon the large contraption that looked like something Leonard of Quirm would build when trying to make a better bird fountain.
Rincewind looked it over, trying to figure out if it was ancient or not, when he heard a clatter and a very feminine voice curse.
He timidly knocked on the wall of the opening - he wasn't quite sure it was a door, it didn't look anything like any door he had seen - and called out, "Hello? Is someone in there? I hope you're not in trouble, I'm really not too good in those situations, just warning you in advance."