Using an image from post 2049, we might be able to gain more understanding about the force(s) that broke the APU/tail cone section off the fuselage:
The mysterious hole seen in the APU fwd firewall appears to have been elongated by what seems to be a harness of Tefzel wires. That is to say, whatever forces were involved here were
strong enough to break the 4 mount points but not enough to rip this harness clean. Incredibly, that section had to remain attached for an amount of time while the hole was being distorted.
And for the critics, I consider my post to be 90% observation and 10% speculation.
