I deduce that it's just as sparkly as first hypothesised, and-- Whoa!

[The inherent problem with grabbing floating bubbles and attempting to crawl on top of them is that they are, in fact, bubbles. And you definitely should not try to sit on a bubble. Because new scientific discovery? Bubbles pop. And so Mabel goes crashing to the ground, the gem bouncing away now free.

Oops.]