oh! what's happened there? Is that rust or a shear stress break? I have the same one as my spare so better check it.
Obviously the safety tendon didn't help you out there so hope it wasn't too far to swim.
Rusted the outer 2mm and then gave way. Pretty lucky it happened right at the end of my session when I was stepping off the board. I'm pretty sure that base would have to be 15+ years old. New one on the way in the post.