Here's my thoughts on the photographic evidence. The forward mount of the VS appears to be missing and the aft mount appears to have torn away the supporting structure within the fuselage. The forward mount may have failed (either in controlled flight through turbulance or during the uncontrolled decent) tilting the VS rearwards (causing the damage to the lower part of the rudder on contact with the top of the APU bay). The VS would then be ripped from the aft mount area and rather like a sycamore seed falling from a tree, gently (reletively speaking) 'helecoptered' it's way to earth. This would account for the small amount of damage to the VS/rudder structure.