I can't even pretend to understand the mechanics of bike damage. The last non-bike rack crash like that one I can recall hearing about seemed to be caused by someting getting kicked up into the spokes, and locking up the wheel. I can't recall how or why the fork was sheared like that, but I could see how (in this case) the frame could get bent like that if those little stubby legs of what's left of the fork where to get planted into the ground at speed. You'd think they'd get ground down or shattered if that happened, though.

I'm just glad we can be having this conversation, instead of planning an ICU visit or a wake for the OP.