Falls happen also when they do a really high underswing and throw the head back and cannot re-grip the bar properly on the back swing. Bad shapes and the head position on the back swing are also risk factors.
That's interesting about throwing the head back on the underswing. It's something I noticed in the video of the girl peeling on the tap swing (above). Other than that, the girl seemed to have pretty good technique/strength so just watching casually you wouldn't expect the fall. It's also a little hard to see from the angle of the video if she has shaping issues in her tap swing.