I had a great, unexpected experience last night, while prowling around a castle doing one of the thieves guild quests. I snuck inside the castle, being careful not to be seen, and I was looking around for a certain item, not really sure exactly where I am suppose to go. I crept down a dark hallway, watching out for a guard I'd seen on patrol, and timing my moves to his, until I reach a far doorway. Just as I'm about to open the door, a figure appears beside me. It's a Kajiit, dressed in a black cloak, and I forget his name, but it was something like Kitty the Pickpocket. It seems that I wasn't the only thief in the castle that night!
He quickly cast an invisitiblity spell on himself and proceeds to attack me. Now, I know the guard is about to return on his patrol and I'm more afraid of him than I am of the thief, so I turn and run back down the hall, with the Kajiit in hot pursuit. I manage to get ahead of him, just as the guard rounds the corner and sees the other thief. The guard yells out about him not suppose to be there, the Kajiit casts another invisitiblity spell, and turns to flee, the guard in pursuit. I slip past the guard into another area, as I hear a pitched battle breaking out. Meanwhile, I went on to find the time I'm looking for and got the hell out of there while I could.