I identified the 180 degree aspect as a "folding over" of the drive arm in a previous post. My guess is that it is due "explosion" from the forward shaft area of the IP(T) join.
If plastic from heat, the Disc would show this signature in a blast from the front side of its Hub. The "Resistance" to the energy from such a blast would be the High Pressure contents of the IP LP cavity (Piston) area, plus the mechanical obstacle of the Stator ring just aft the IP Disc. It is pure and simple guesswork, and only that.........
Beyond this, the "flattening over" of the Drive Arm metal may have been amplified by contact with the mounting base of the Stator assembly, from which it may have rebounded, and with the impetus of Highly energetic Gas Path, thrown forward and "Out" after disintegration.
Rgds. bear