This is a unusual knee wall - it's just a part of curtain wall above the highest slab. The waterproofing EPDM membrane is glued on the top of wall.

The most obvious is the perforation on the first plane. This kind of damage I rarely mention because it is very easy to notice and to repair. I am sure earlier or later somebody will patch this hole.The two other deficiencies are less obvious and less likely to be corrected.  On the left side the bottom edge of EPDM membrane is cut too short to be properly tucked behind the long horizontal pressure bar. The rainwater will travel below the membrane and leak inside the building. 

Another problem is missing masonry wall in window opening left beyond.  This masonry opening was to be closed but only the terra-cotta seal has been chipped out to make space for vertical mullion. No end dam has been created at the lashing because the support wall is missing.  Neither the air seal caulking between mullion and masonry wall has been produced.

I expect that neither roofers nor caulkers would return to this spot after long awaited masons' visit.  Even if so, probably the coping would already be installed at this time, obstructing the access.  Trade rules will prevent caulkers and roofers from dismantling the coping and nobody will be eager to call metal workers again to do it.  The magic circle would close.

The pictures below show the upper ends of vertical mullions.  Here the water can entry inside the mullion profile, gaining access inside the building.

This picture shows the corner mullion.