to screen the underside of the drone from view might indicate some damage from a hard landing. The fly-by-wire control must have worked to the last moment, because, the craft having no "natural" aerodynamic stability, otherwise it would have crashed. The idea that someone took over flight control and brought it down to land, but had no suitable runway and had to do with some flat ground with obstacles which damaged the belly part, appears plausible.
Week of floods kills 22 in Vietnam (DPA)
from the article: Iran state television displays 'downed U.S. surveillance drone'