There was about 2 meters of clear area around the walls. It was narrow, but it was wide enough to see anomalies from the perimeter of the wall.
There were only about 4 guards on the walls. However, because of the arrangement (or non-arrangement) of this place, it wouldn't be easy to target the guards. First, three meters above was way above eye level. If they wanted to have a chance of a good shot, they had to be on one of the houses.
However, there were few windows in system houses—likely in consideration for the extreme weather—and those they had happened to be facing the streets. This made sense as the houses were built right next to each other. However, this also meant there was no direct place to target the guards from.
The best the archers—Crow and Juan—could do was position on the 'front' windows, hoping for the guard to pass whatever limited line segment they could see.
