I believe the rider of the GSXR 750 who broke his frame frequents these forums. Everyone saw the aftermath of the crash but it seems no one actually saw the crash happen. There was some speculation about what happened but I'd rather not rely on rummor.
The biggest question is how you walked away from a crash nasty enough to break your bike in half.
The second question is what events lead up to the crash. Slamming into a concrete wall is something I would like to avoid (and so would everyone else) so knowing how it happened could help the rest of us stay safer.
Most importantly, we are all glad you were able to walk away from the crash in one piece.
If you are out there... please let us know.