Kazimir and Delfig had just finished climbing the ladder onto the level of the tower which is equal in height to the top of the city wall. There are three guards in the room, all disturbed by the sounds of distant booms and pops coming from the core of the city—which can’t be seen without opening the door facing both the wall and the city centre. However, the scene through the arrow slits in the tower is enough to disturb all three guards.
Two guards hold heavy crossbows on the thief/assassin pair, and one of them will notice “fred,” who is tied up on the bed on the level below. “What is going on?” will ask the guard who seems to be the leader of the three.
Have I forgotten any details?