The only thing I can figure out without going into the motor...

The only thing I can figure out without going into the motor is that it looks like it broke a main stud (one of three inside the engine which holds the crankshaft in place), ... From there, somehow it wedged the rod in the cylinder which eventually led to it breaking. As soon as it started, you could tell something was wrong. It was the first time in all my years in racing that I've seen something like this happen to us.