SLT12 seems to contain two wall segments from two different wall systems.
The small section of curved wall at the northeast corner of SLT12 is part of the same wall curved wall of a room that is predominantly in SLT9 to the northeast, but also in SLT10 to the east and SLT11 to the north. All walls composing this room at multi-coursed, including the segment in SLT12.
The longer section of straight wall that runs bearing NNW has only one course. Meaning, it might not be a wall, or perhaps a later construction.
Tomorrow I will continue excavating locus 2, although just the northern half. This will allow me to further explore the wall systems in the trench.