There's a minimalist kind of purity to this shot, as the bubble is almost colourless and Sarah's hand is coming in right at the side. So, the unzipping action of the bubble is just, well, so clear. Look at the dying reflections inside! The corona's about to die too!
This shot is also a tribute to how clear the Nikon D90 is at high ISO (800 here).
You can really see the film tearing, ripping, splitting, breaking. This shouldn't be termed 'popping' at all!!!
(LOL (much later). I was actually very wrong about the splitting and cracking, because bubbles do pop into droplets, it's just that the speed of the shot makes the tiny droplets look like trails. I'm sticking with my original title though, just because I like it!)