She was doing a camel spin with her chest turned upwards, when the centrifugal force, combined with the ample size of her breasts, combined with the strain of the twist of that position, combined with the flimsy little strap holding her top -- and, *snap*! She ended up doing a topless number.

It's not a pretty picture though. She has this "oh, shit" horrified look on her face, although apparently she finished her spin.

Icarus