Did you check that everything is working OK in the rest of the driveline?? My thought from looking at the carnage is that something locked up and the motor just torqued the heck out of the motor mount.

I had something similar on my truggy albeit not as bad that my heat sink for my Medusa one of the fins got cause by the center diff outdrive and I wasnt paying attention and gave it some throttle, it actually spun the heatsink right under the motor, which it doesnt actually fit under!!!!

I would check that everything is working right in the driveline personally.