Only help I can offer is that I've seen a friend trying to "climb" a log (landing with the biggest ring/bash guard on the obstacle with a pedal in an up-and-forward position, then pushing down on the pedal to clear the obstacle) which caused the BB to seize momentarily and unscrew itself enough to throw the front shifting off. The messed up shifting what caused him to notice that something had happened. We adjusted the shifting and the BB worked well enough to let us finish the ride.
But this was a steel frame. I can imagine if something similar was to happen to an alloy frame, a couple of miles of continued riding might possibly trash the threads.