Reply #110: Please allow an actuary to assist all you amazing engineers.

[eomer]

Your best argument is that after some initial phase of crush-up, the give in Part C was exhausted enough so that its now condensed (though chaotic) mass became sufficient to begin crushing Part A.

As long as you keep insisting that your equations prove that crush-down would begin immediately after the one-story drop, you are obviously disproved by the visual evidence.