Prada:
based on the lines that you drew where you show what look to be failure lines ..
If for example only one half of the HS failed/tore off, would the instant imbalance of downward forces from the other half of the HS create enough torsion (twist/torque) on a vertical stab and tail to make it fail along that line/zone ... with the aft bulkhead being strong enough to resist it?
My guess is "no" because the area around the HS has to be a structurally strong part of the aircraft due to the loads the HS puts on it all the time in flight. However, I am doing a back of the napkin guess, and maybe load paths would make that a possibility if the back end experienced a twisting type of load.