With numerous fiduciary points added by A.Cooper, as well as the two rockfalls, the area marked in red appears to collapse down without breaking up. The driving factor of the changes appears, from the evidence of the previously discovered rock movements, to be contraction and expansion of the surface layer due to crustal movements. The zig-zag area casting a shadow on to the surface below seems to be a piece of fractured and exposed crust that is several metres, perhaps up to tens of metres above the surface.
"Rocks", even small ones, appear unchanged and move in sympathy with the surface.
Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0
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All dotted annotations by Marco Parigi and A. Cooper
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