Very interesting. He is a good listener. He spends time, standing and waiting, and time picking just the right vantage point, and then time very carefully framing, possibly then readjusting his vantage point. If he needs a lower position his head is tilted left a considerable way, but he gets the camera level. Unless he doesn't want it level. The Fuji has a spirit level but not sure if that can be used hand held with the eye to the viewfinder.
As to the subject, and the images, an amazing place. There is a David Hare Faber book, with two parts, Berlin, and The Wall. A good supplement. A new perspective on all this is given in the last 12 months.