"Oh good. Okay. Originally I just wanted to pass through their room on my way out of town, but they convinced me to stick around, which made me pretty sure they were planning something. And then I found out they actually were planning something - betraying me to the authorities and making off with the crown themselves, to be specific - so I preemptively dumped them in a mud puddle and bolted, and then led both them and the Royal Guard on a merry chase through the woods in two different directions, which was excitingly hard to pull off. And at the end of it when I was just getting to be very firmly sure I'd lost them all, I stumbled on this tower, which seemed like a much better place to stay the night than under a tree or in a ravine. And it couldn't possibly be occupied, because there was no door in the bottom. Silly me, in retrospect." He shrugs and nibbles on the last of his bread.