Oh crap. I feel your pain, Scott. I once had something fall onto a tripod-mounted rosewood 4x5 and knock it over backwards. Hard. On asphalt. I watched it crash in that moment of helplessness. Too far away to do anything. Like when you helplessly watch yourself locking your car keys inside, but there's not enough time for the STOP message to make it from your eyes to your brain to your hands. I was crushed. So was the camera.
Fortunately the three breaks/cracks were so well defined that I was able to use Gorilla Glue and wood clamps to put it back together perfectly. I still have it and use it. You can't even tell it's been in a severe rear-end collision.