Anyone in her position that would use “slope of roof” as a defense needs to not only go, but see if there are penalties to face for her complete and utter incompetence.
The slope had nothing to do with it. Watch the after action videos. There were several flat roofs (walkway/doorway over hangs) connected to the buildings. Agents were walking all over the flat roofs between buildings while investigating. Also, the slope angle was ridiculously minor, likely a bare minimum slope.
“Slope of the roof” is why you have an asset covering the back side of the freaking roof!!!